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Subject: [sipcore] Questions on SIP over websockets.
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HI,

As part of JSR 359 (SIP Servlet 2.0) standardization, we are working on 
supporting SIP
over websocket ID in SIP servlets. I have a few questions on this I-D 
and will be great,
if you can answer the following questions.

- How do you envision the sip/websocket to be used? Do you expect 
webservers
   that use webrtc to also support sip/websocket or do you expect, the 
sip/websocket
   to be supported by the sip servers independent of webservers and thus 
web
   application and sip application run as independent entities? Or both?

- When a call come from a SIP UA to web browser (reverse of what is 
shown in 8.2),
   one option the draft is suggesting is the use of RFC 5626 as the way 
to identify the
   flow to send the request. But the draft does not stop a proxy/b2b 
from using some other
   mechanism either. Is that intentional? Do the spec allow a webserver 
to use a
   websocket connection based on its logic to send the requests to the 
client?

- JSEP in webrtc (section A.1.5) has a model that simply does 
offer/answer using INVITE dialog.
   So, if I understand correctly, REGISTER is not really required for a 
web application.
   Is that model allowed? The examples in the rfc draft  and reference 
to 5626 suggest the
   use of REGISTER. Is that the intention?

thanks,
Binod.

From ibc@aliax.net  Tue May  7 04:50:27 2013
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From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= <ibc@aliax.net>
Date: Tue, 7 May 2013 13:50:05 +0200
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Cc: "SIPCORE \(Session Initiation Protocol Core\) WG" <sipcore@ietf.org>
Subject: Re: [sipcore] Questions on SIP over websockets.
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2013/5/7 Binod <binod.pg@oracle.com>:
> As part of JSR 359 (SIP Servlet 2.0) standardization, we are working on
> supporting SIP
> over websocket ID in SIP servlets. I have a few questions on this I-D and
> will be great,
> if you can answer the following questions.
>
> - How do you envision the sip/websocket to be used? Do you expect webserv=
ers
>   that use webrtc to also support sip/websocket or do you expect, the
> sip/websocket
>   to be supported by the sip servers independent of webservers and thus w=
eb
>   application and sip application run as independent entities? Or both?

I expect both, but for now all the server implementations I know are
pure SIP servers with recent WebSocket support.



> - When a call come from a SIP UA to web browser (reverse of what is shown=
 in
> 8.2),
>   one option the draft is suggesting is the use of RFC 5626 as the way to
> identify the
>   flow to send the request. But the draft does not stop a proxy/b2b from
> using some other
>   mechanism either. Is that intentional? Do the spec allow a webserver to
> use a
>   websocket connection based on its logic to send the requests to the
> client?

SIP rules define that a request is routed based on its Route headers
and Request-URI value. If a SIP-WebSocket proxy/server/entity routes
the requests to a WS client based on other criterion then it is not
playing SIP rules so such a behavior is out of the scope of SIP
protocol and the draft.

Anyhow some SIP servers/PBXs/B2BUAs already implement their own
routing logic, regardless they don't implement RFC 5626. This is not
something new in SIP over WebSocket, some occurs in SIP over TCP.




> - JSEP in webrtc (section A.1.5) has a model that simply does offer/answe=
r
> using INVITE dialog.
>   So, if I understand correctly, REGISTER is not really required for a we=
b
> application.
>   Is that model allowed? The examples in the rfc draft  and reference to
> 5626 suggest the
>   use of REGISTER. Is that the intention?

draft-sipcore-sip-websocket just defines a new transport for SIP, and
not a new SIP protocol. If the SIP WebSocket Client does not perform
SIP registration then it's hard to understand how a server/proxy could
route requests to it. Of course it can be done in tons of proprietary
ways, but the draft plays to SIP rules and thus registration + RFC
5626 seems a proper way for a SIP WebSocket Client to be able to
receive incoming initial requests.


Let us not consider SIP over WebSocket as something else than what it
is: a new transport for SIP protocol, no more. This is still SIP.


Best regards.


--
I=C3=B1aki Baz Castillo
<ibc@aliax.net>

From binod.pg@oracle.com  Tue May  7 05:19:36 2013
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Subject: Re: [sipcore] Questions on SIP over websockets.
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Thanks Inaki.

On the JSEP and REGISTER, you are saying that, the server MUST use
REGISTER + 5626. Did I get it right?

In that case, why it is not mandated in the I-D?

Given WS connections are always initiated from the client, Is there any way
other than using 5626 to send a request from the server to the
websocket client?

thanks,
Binod.

On Tuesday 07 May 2013 05:20 PM, IÃ±aki Baz Castillo wrote:
> 2013/5/7 Binod <binod.pg@oracle.com>:
>> As part of JSR 359 (SIP Servlet 2.0) standardization, we are working on
>> supporting SIP
>> over websocket ID in SIP servlets. I have a few questions on this I-D and
>> will be great,
>> if you can answer the following questions.
>>
>> - How do you envision the sip/websocket to be used? Do you expect webservers
>>    that use webrtc to also support sip/websocket or do you expect, the
>> sip/websocket
>>    to be supported by the sip servers independent of webservers and thus web
>>    application and sip application run as independent entities? Or both?
> I expect both, but for now all the server implementations I know are
> pure SIP servers with recent WebSocket support.
>
>
>
>> - When a call come from a SIP UA to web browser (reverse of what is shown in
>> 8.2),
>>    one option the draft is suggesting is the use of RFC 5626 as the way to
>> identify the
>>    flow to send the request. But the draft does not stop a proxy/b2b from
>> using some other
>>    mechanism either. Is that intentional? Do the spec allow a webserver to
>> use a
>>    websocket connection based on its logic to send the requests to the
>> client?
> SIP rules define that a request is routed based on its Route headers
> and Request-URI value. If a SIP-WebSocket proxy/server/entity routes
> the requests to a WS client based on other criterion then it is not
> playing SIP rules so such a behavior is out of the scope of SIP
> protocol and the draft.
>
> Anyhow some SIP servers/PBXs/B2BUAs already implement their own
> routing logic, regardless they don't implement RFC 5626. This is not
> something new in SIP over WebSocket, some occurs in SIP over TCP.
>
>
>
>
>> - JSEP in webrtc (section A.1.5) has a model that simply does offer/answer
>> using INVITE dialog.
>>    So, if I understand correctly, REGISTER is not really required for a web
>> application.
>>    Is that model allowed? The examples in the rfc draft  and reference to
>> 5626 suggest the
>>    use of REGISTER. Is that the intention?
> draft-sipcore-sip-websocket just defines a new transport for SIP, and
> not a new SIP protocol. If the SIP WebSocket Client does not perform
> SIP registration then it's hard to understand how a server/proxy could
> route requests to it. Of course it can be done in tons of proprietary
> ways, but the draft plays to SIP rules and thus registration + RFC
> 5626 seems a proper way for a SIP WebSocket Client to be able to
> receive incoming initial requests.
>
>
> Let us not consider SIP over WebSocket as something else than what it
> is: a new transport for SIP protocol, no more. This is still SIP.
>
>
> Best regards.
>
>
> --
> IÃ±aki Baz Castillo
> <ibc@aliax.net>
> _______________________________________________
> sipcore mailing list
> sipcore@ietf.org
> https://www.ietf.org/mailman/listinfo/sipcore


From ibc@aliax.net  Tue May  7 05:35:25 2013
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From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= <ibc@aliax.net>
Date: Tue, 7 May 2013 14:35:03 +0200
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Cc: "SIPCORE \(Session Initiation Protocol Core\) WG" <sipcore@ietf.org>
Subject: Re: [sipcore] Questions on SIP over websockets.
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2013/5/7 Binod <binod.pg@oracle.com>:
> Thanks Inaki.
>
> On the JSEP and REGISTER, you are saying that, the server MUST use
> REGISTER + 5626. Did I get it right?

No, I never said "MUST" :)


> In that case, why it is not mandated in the I-D?

The SIPCORE WG already decided in a previous IETF meeting that the
draft should not mandate Outbound, and I agree, since the draft just
defines a new transport for SIP.



> Given WS connections are always initiated from the client, Is there any w=
ay
> other than using 5626 to send a request from the server to the
> websocket client?

Yes, proprietary solutions like those implemented in MOST of the SIP
servers when a SIP TCP client connects to it and the server reuses
such a TCP connection for routing *everything* to the UA regardless
RFC 5626 is not used, announced or supported by the UA and/or the
server. Examples: Asterisk, SER/Kamailio/OpenSIPS, 99% of comercial
SIP servers I've tested, etc.


Regards.








--
I=C3=B1aki Baz Castillo
<ibc@aliax.net>

From binod.pg@oracle.com  Tue May  7 08:34:04 2013
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Subject: Re: [sipcore] Questions on SIP over websockets.
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On Tuesday 07 May 2013 06:05 PM, IÃ±aki Baz Castillo wrote:
> 2013/5/7 Binod <binod.pg@oracle.com>:
>> Thanks Inaki.
>>
>> On the JSEP and REGISTER, you are saying that, the server MUST use
>> REGISTER + 5626. Did I get it right?
> No, I never said "MUST" :)
>
>
>> In that case, why it is not mandated in the I-D?
> The SIPCORE WG already decided in a previous IETF meeting that the
> draft should not mandate Outbound, and I agree, since the draft just
> defines a new transport for SIP.
>
>
>
>> Given WS connections are always initiated from the client, Is there any way
>> other than using 5626 to send a request from the server to the
>> websocket client?
> Yes, proprietary solutions like those implemented in MOST of the SIP
> servers when a SIP TCP client connects to it and the server reuses
> such a TCP connection for routing *everything* to the UA regardless
> RFC 5626 is not used, announced or supported by the UA and/or the
> server. Examples: Asterisk, SER/Kamailio/OpenSIPS, 99% of comercial
> SIP servers I've tested, etc.
>
>
> Regards.

It matches with my understanding. As it stands today, the I-D allows,
though it doesn't encourage, webservers to use their own mechanism
to route the SIP messages instead of using REGISTER+5626.

I don't necessarily disagree with either approach. Just wanted to
make sure that the standard we are working on allows what the
I-D intends to allow.

Thanks.
Binod.

>
>
>
>
>
>
>
>
> --
> IÃ±aki Baz Castillo
> <ibc@aliax.net>
> _______________________________________________
> sipcore mailing list
> sipcore@ietf.org
> https://www.ietf.org/mailman/listinfo/sipcore


From pkyzivat@alum.mit.edu  Tue May  7 10:58:12 2013
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Subject: Re: [sipcore] Questions on SIP over websockets.
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On 5/7/13 11:33 AM, Binod wrote:
> On Tuesday 07 May 2013 06:05 PM, IÃ±aki Baz Castillo wrote:
>> 2013/5/7 Binod <binod.pg@oracle.com>:
>>> Thanks Inaki.
>>>
>>> On the JSEP and REGISTER, you are saying that, the server MUST use
>>> REGISTER + 5626. Did I get it right?
>> No, I never said "MUST" :)
>>
>>
>>> In that case, why it is not mandated in the I-D?
>> The SIPCORE WG already decided in a previous IETF meeting that the
>> draft should not mandate Outbound, and I agree, since the draft just
>> defines a new transport for SIP.

Not mandating it allows flexibility and support of future extensions.
If you are building strictly standards compliant products, then *for 
now* outbound is the only way you will be able to receive outbound 
calls. But of course you could still *initiate* calls without this.

>>> Given WS connections are always initiated from the client, Is there
>>> any way
>>> other than using 5626 to send a request from the server to the
>>> websocket client?
>> Yes, proprietary solutions like those implemented in MOST of the SIP
>> servers when a SIP TCP client connects to it and the server reuses
>> such a TCP connection for routing *everything* to the UA regardless
>> RFC 5626 is not used, announced or supported by the UA and/or the
>> server. Examples: Asterisk, SER/Kamailio/OpenSIPS, 99% of comercial
>> SIP servers I've tested, etc.
>>
>>
>> Regards.
>
> It matches with my understanding. As it stands today, the I-D allows,
> though it doesn't encourage, webservers to use their own mechanism
> to route the SIP messages instead of using REGISTER+5626.
>
> I don't necessarily disagree with either approach. Just wanted to
> make sure that the standard we are working on allows what the
> I-D intends to allow.

There is nothing inherently *wrong* with this. SIP gives proxies great 
leeway to employ their own routing policies. It just means that the 
portions of the system that do this are *proprietary*.

	Thanks,
	Paul


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Cc: sipcore@ietf.org
Subject: Re: [sipcore] [dispatch] SIP outbound and in-dialog requests
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[Moving this discussion to Sipcore.]

[Sorry about losing the diacritic on the "n".]

> From: IC1aki Baz Castillo <ibc@aliax.net>
> 
> Anyhow, it seems that nobody wants to reply to the problem I describe.
> Is it not clear? Let me re-explain it:

It is not at all clear to me.  There may be important details that I
don't recall at this point, but even so, it would be very useful if
you could provide additional explanation at a number of points.

> - Bob registers with GRUU and Outbound. EDGE adds Path:
> 
>    Path: <sip:FLOW_TOKEN_1@EDGE;lr>
> 
> 
> - Alice calls Bob. Once the call is established, the route set from
> Alice is as follows:
> 
>   Route: <sip:REGISTRAR;lr>
>   Route: <sip:FLOW_TOKEN_1@EDGE;lr>

OK, you need to explain why the registrar record-routes itself.

> - So an in-dialog INFO from Alice looks as follows:
> 
>   INFO sip:bob@biloxi.com;gr=GRUU_1
>   Route: <sip:REGISTRAR;lr>
>   Route: <sip:FLOW_TOKEN_1@EDGE;lr>
> 
> - When the INFO arrives to the REGISTRAR, the REGISTRAR MUST perform
> GRUU lookup, RIGHT??

No, because the registrar only needs to forward the request to
<sip:FLOW_TOKEN_1@EDGE;lr>, the next address in the route set after
the registrar's address, and that doesn't contain a GRUU.  In general,
a SIP element shouldn't be looking at addresses beyone the next
address in the route set.

Dale

From pkyzivat@alum.mit.edu  Tue May  7 14:23:54 2013
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Subject: Re: [sipcore] [dispatch] SIP outbound and in-dialog requests
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At end...

On 5/7/13 4:29 PM, Dale R. Worley wrote:
> [Moving this discussion to Sipcore.]
>
> [Sorry about losing the diacritic on the "n".]
>
>> From: IC1aki Baz Castillo <ibc@aliax.net>
>>
>> Anyhow, it seems that nobody wants to reply to the problem I describe.
>> Is it not clear? Let me re-explain it:
>
> It is not at all clear to me.  There may be important details that I
> don't recall at this point, but even so, it would be very useful if
> you could provide additional explanation at a number of points.
>
>> - Bob registers with GRUU and Outbound. EDGE adds Path:
>>
>>     Path: <sip:FLOW_TOKEN_1@EDGE;lr>
>>
>>
>> - Alice calls Bob. Once the call is established, the route set from
>> Alice is as follows:
>>
>>    Route: <sip:REGISTRAR;lr>
>>    Route: <sip:FLOW_TOKEN_1@EDGE;lr>
>
> OK, you need to explain why the registrar record-routes itself.
>
>> - So an in-dialog INFO from Alice looks as follows:
>>
>>    INFO sip:bob@biloxi.com;gr=GRUU_1
>>    Route: <sip:REGISTRAR;lr>
>>    Route: <sip:FLOW_TOKEN_1@EDGE;lr>
>>
>> - When the INFO arrives to the REGISTRAR, the REGISTRAR MUST perform
>> GRUU lookup, RIGHT??
>
> No, because the registrar only needs to forward the request to
> <sip:FLOW_TOKEN_1@EDGE;lr>, the next address in the route set after
> the registrar's address, and that doesn't contain a GRUU.  In general,
> a SIP element shouldn't be looking at addresses beyone the next
> address in the route set.

I always thought that, (and I still do, BUT) if you read 3261 carefully, 
you will discover that the instructions are to first look at the R-URI, 
and if you are responsible for it, then translate it. Once you have done 
that, then you still use the Route to decide on next place to go.

I think it is the wrong thing to do, but it is what it says. IMO you 
should not pay any attention to the R-URI if there is a Route header. 
But that's just me.

The other thing is: if the contact is a GRUU, you really *want* it to 
translate it for each request in the dialog. And you want there to be no 
pending Route headers at that time, so that the Path corresponding to 
the GRUU can be followed.

	Thanks,
	Paul


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Date: Fri, 10 May 2013 12:08:44 +0100
From: Jonathan Hansford <Jonathan@hansfords.net>
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Subject: [sipcore] SIP and Internationalisation
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Hi, 

I am currently looking at a number of Internet protocols for
international use and am looking to see how much commonality there is
between them. A number are, or are in the process of becoming, IDNA2008
aware (e.g. DNS - RFC 5890, SMTP - RFC 6530/1, XMPP -
draft-ietf-xmpp-6122bis-07). 

I have been trying to identify what
support for internationalization there is within SIP and can find no
reference to it. Can you advise what level of support (if any) SIP
currently provides for countries whose native language is not
(adequately) supported by US ASCII and/or whether there are any plans to
address this in the future? 

Thanks, 

Jonathan Hansford 
--=_758f6a6545c06600eeeda4d840b6cad6
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN">
<html><body>
<p>Hi,</p>
<p>I am currently looking at a number of Internet protocols for internation=
al use and am looking to see how much commonality there is between them. A =
number are, or are in the process of becoming, IDNA2008 aware (e.g. DNS - R=
FC 5890, SMTP - RFC 6530/1, XMPP - draft-ietf-xmpp-6122bis-07).</p>
<p>I have been trying to identify what support for internationalization the=
re is within SIP and can find no reference to it. Can you advise what level=
 of support (if any) SIP currently provides for countries whose native lang=
uage is not (adequately) supported by US ASCII and/or whether there are any=
 plans to address this in the future?</p>
<p>Thanks,</p>
<p>Jonathan Hansford</p>
</body></html>

--=_758f6a6545c06600eeeda4d840b6cad6--


From gunnar.hellstrom@omnitor.se  Fri May 10 08:08:52 2013
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Subject: Re: [sipcore] SIP and Internationalisation
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Jonathan,
Most items in SIP are UTF-8 coded, so I think there is good preparedness 
for internationlaization.
I think you should coordinate your activities with this draft, that is 
going in the other direction - trying to find out the minimal common set 
to be used in addressing in multiple services. It might need your 
results as a separate section and its current information may be answer 
on your current question.
https://datatracker.ietf.org/doc/draft-saintandre-username-interop

Regards

Gunnar Hellström

On 2013-05-10 13:08, Jonathan Hansford wrote:
>
> Hi,
>
> I am currently looking at a number of Internet protocols for 
> international use and am looking to see how much commonality there is 
> between them. A number are, or are in the process of becoming, 
> IDNA2008 aware (e.g. DNS - RFC 5890, SMTP - RFC 6530/1, XMPP - 
> draft-ietf-xmpp-6122bis-07).
>
> I have been trying to identify what support for internationalization 
> there is within SIP and can find no reference to it. Can you advise 
> what level of support (if any) SIP currently provides for countries 
> whose native language is not (adequately) supported by US ASCII and/or 
> whether there are any plans to address this in the future?
>
> Thanks,
>
> Jonathan Hansford
>
>
>
> _______________________________________________
> sipcore mailing list
> sipcore@ietf.org
> https://www.ietf.org/mailman/listinfo/sipcore


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<html>
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    <div class="moz-cite-prefix">Jonathan,<br>
      Most items in SIP are UTF-8 coded, so I think there is good
      preparedness for internationlaization.<br>
      I think you should coordinate your activities with this draft,
      that is going in the other direction - trying to find out the
      minimal common set to be used in addressing in multiple services.
      It might need your results as a separate section and its current
      information may be answer on your current question.<br>
      <a class="moz-txt-link-freetext"
href="https://datatracker.ietf.org/doc/draft-saintandre-username-interop">https://datatracker.ietf.org/doc/draft-saintandre-username-interop</a>
      <br>
      <pre wrap="">Regards

Gunnar Hellstr&ouml;m
</pre>
      On 2013-05-10 13:08, Jonathan Hansford wrote:<br>
    </div>
    <blockquote
      cite="mid:984edebb3d71943ddd13940a3ea1b148@imap.plus.net"
      type="cite">
      <p>Hi,</p>
      <p>I am currently looking at a number of Internet protocols for
        international use and am looking to see how much commonality
        there is between them. A number are, or are in the process of
        becoming, IDNA2008 aware (e.g. DNS - RFC 5890, SMTP - RFC
        6530/1, XMPP - draft-ietf-xmpp-6122bis-07).</p>
      <p>I have been trying to identify what support for
        internationalization there is within SIP and can find no
        reference to it. Can you advise what level of support (if any)
        SIP currently provides for countries whose native language is
        not (adequately) supported by US ASCII and/or whether there are
        any plans to address this in the future?</p>
      <p>Thanks,</p>
      <p>Jonathan Hansford</p>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
sipcore mailing list
<a class="moz-txt-link-abbreviated" href="mailto:sipcore@ietf.org">sipcore@ietf.org</a>
<a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/sipcore">https://www.ietf.org/mailman/listinfo/sipcore</a>
</pre>
    </blockquote>
    <br>
  </body>
</html>

--------------080004030102040607070307--

From stpeter@stpeter.im  Fri May 10 08:22:34 2013
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On 5/10/13 9:08 AM, Gunnar Hellstrom wrote:
> Jonathan, Most items in SIP are UTF-8 coded, so I think there is
> good preparedness for internationlaization.

In my experience, no one is ever fully prepared for
internationalization. :-)

> I think you should coordinate your activities with this draft, that
> is going in the other direction - trying to find out the minimal
> common set to be used in addressing in multiple services. It might
> need your results as a separate section and its current information
> may be answer on your current question. 
> https://datatracker.ietf.org/doc/draft-saintandre-username-interop

That is a very early effort, and I deliberately punted on the i18n
aspects. If the work is compelling, I can address i18n in a future
version.

> On 2013-05-10 13:08, Jonathan Hansford wrote:
>> 
>> Hi,
>> 
>> I am currently looking at a number of Internet protocols for 
>> international use and am looking to see how much commonality
>> there is between them. A number are, or are in the process of
>> becoming, IDNA2008 aware (e.g. DNS - RFC 5890, SMTP - RFC 6530/1,
>> XMPP - draft-ietf-xmpp-6122bis-07).

In addition to the IDNA2008 work, I strongly recommend that you look
at the output of the PRECIS WG (which generalizes the IDNA2008
approach to identifiers other than domain names, such as the localpart
of a SIP URI):

http://datatracker.ietf.org/wg/precis/

>> I have been trying to identify what support for
>> internationalization there is within SIP and can find no
>> reference to it. Can you advise what level of support (if any)
>> SIP currently provides for countries whose native language is not
>> (adequately) supported by US ASCII and/or whether there are any
>> plans to address this in the future?

I can't speak to that directly, but I'm happy to help.

Peter

- --
Peter Saint-Andre
https://stpeter.im/


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On 5/10/13 9:22 AM, Peter Saint-Andre wrote:
> On 5/10/13 9:08 AM, Gunnar Hellstrom wrote:
>> Jonathan, Most items in SIP are UTF-8 coded, so I think there is 
>> good preparedness for internationlaization.
> 
> In my experience, no one is ever fully prepared for 
> internationalization. :-)

Someone asked me this off-list, but it's useful to discuss it in public...

Thinking that UTF-8 solves your internationalization problems is like
thinking that TLS solves your security problems. I hate to break it to
you, but it's not that simple. Yes, using UTF-8 encoding is better
than being stuck with ASCII, but there are many many challenging
issues with internationalization.

The following slides might help orient folks who are new to i18n:

https://stpeter.im/files/i18n-intro.pdf

Peter

- -- 
Peter Saint-Andre
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From adam@nostrum.com  Fri May 10 09:17:02 2013
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Jonathan:

As far as I know, there has been no serious work on SIP's i18n story so 
far. The closest we come is the use of UTF-8 everywhere. While an 
international character encoding is a necessary part of the story, it's 
far from sufficient.

I've known for quite some time that SIP's IDN story is conspicuous by 
its absence. I've never really had the time to poke at existing, 
deployed implementations to see what they do when you feed unicode 
characters into domain names. Given the lack of specification, I doubt 
most of them do anything useful. Some might accidentally kind of work, 
depending on what punycode support their underlying DNS libraries 
provide, but the chances of this being done in a way that yields success 
seems extremely slim.

The other area we need to worry about, as Gunnar and Peter hinted at, is 
usernames. The big issue here (as I understand it) is the application of 
stringprep for the purpose of measuring username equality.

I'd been keeping my eyes, very loosely, on the IRI work in hope that we 
could leverage its output in a future SIP internationalization effort, 
since it would hopefully provide guidance on both the IDN and stringprep 
issues. Sadly, that work seems to have been terminated before producing 
useful output, so we'll have to make our own way through this morass.

There are probably some similar issues for password normalization, 
although I'm not sure that's as much of an issue, since passwords, by 
their nature, are generated in a more repeatable way than usernames are. 
I would expect that people who have spent far more time than I have 
thinking about the problem have some ideas here.

Aside from URIs and Digest credentials, there is mercifully little in 
the way of protocol fields intended to be user-visible for SIP. A 
handful, like Organization and Subject, were specified in a way that 
implied that they should be user-renderable; however, in practice, no 
one ever uses these fields (and, in any case, I don't think they pose 
any particular i18n challenges, as these fields are not 
machine-interpretable, and do allow UTF-8 characters).

In practice, most implementations them do a lousy job of l10n (e.g. for 
response Reason-Phrases) , but I don't think we're missing anything 
protocol-wise; this seems to be a failing of the implementations themselves.

I think that's the vast majority of what you need to worry about in 
terms of the core SIP protocol. Now, there are some protocols we use 
(e.g., BFCP, TLS, CCMP, S/MIME) that we would rely on having sufficient 
internationalization support, but I would be inclined to consider those 
a separable effort.

In any case, if you can find enough critical mass of people with the 
energy and time to move this work forward, I would welcome it 
wholeheartedly. I believe that, the way the charter is currently 
written, this work is likely to fall under the purview of the SIPCORE 
working group.

/a


On 5/10/13 06:08, Jonathan Hansford wrote:
>
> Hi,
>
> I am currently looking at a number of Internet protocols for 
> international use and am looking to see how much commonality there is 
> between them. A number are, or are in the process of becoming, 
> IDNA2008 aware (e.g. DNS - RFC 5890, SMTP - RFC 6530/1, XMPP - 
> draft-ietf-xmpp-6122bis-07).
>
> I have been trying to identify what support for internationalization 
> there is within SIP and can find no reference to it. Can you advise 
> what level of support (if any) SIP currently provides for countries 
> whose native language is not (adequately) supported by US ASCII and/or 
> whether there are any plans to address this in the future?
>
> Thanks,
>
> Jonathan Hansford
>
>
>
> _______________________________________________
> sipcore mailing list
> sipcore@ietf.org
> https://www.ietf.org/mailman/listinfo/sipcore


--------------050201090501000109070906
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<html>
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    <meta content="text/html; charset=ISO-8859-1"
      http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    <div class="moz-cite-prefix">Jonathan:<br>
      <br>
      As far as I know, there has been no serious work on SIP's i18n
      story so far. The closest we come is the use of UTF-8 everywhere.
      While an international character encoding is a necessary part of
      the story, it's far from sufficient.<br>
      <br>
      I've known for quite some time that SIP's IDN story is conspicuous
      by its absence. I've never really had the time to poke at
      existing, deployed implementations to see what they do when you
      feed unicode characters into domain names. Given the lack of
      specification, I doubt most of them do anything useful. Some might
      accidentally kind of work, depending on what punycode support
      their underlying DNS libraries provide, but the chances of this
      being done in a way that yields success seems extremely slim.<br>
      <br>
      The other area we need to worry about, as Gunnar and Peter hinted
      at, is usernames. The big issue here (as I understand it) is the
      application of stringprep for the purpose of measuring username
      equality.<br>
      <br>
      I'd been keeping my eyes, very loosely, on the IRI work in hope
      that we could leverage its output in a future SIP
      internationalization effort, since it would hopefully provide
      guidance on both the IDN and stringprep issues. Sadly, that work
      seems to have been terminated before producing useful output, so
      we'll have to make our own way through this morass.<br>
      <br>
      There are probably some similar issues for password normalization,
      although I'm not sure that's as much of an issue, since passwords,
      by their nature, are generated in a more repeatable way than
      usernames are. I would expect that people who have spent far more
      time than I have thinking about the problem have some ideas here.<br>
      <br>
      Aside from URIs and Digest credentials, there is mercifully little
      in the way of protocol fields intended to be user-visible for SIP.
      A handful, like Organization and Subject, were specified in a way
      that implied that they should be user-renderable; however, in
      practice, no one ever uses these fields (and, in any case, I don't
      think they pose any particular i18n challenges, as these fields
      are not machine-interpretable, and do allow UTF-8 characters).<br>
      <br>
      In practice, most implementations them do a lousy job of l10n
      (e.g. for response Reason-Phrases) , but I don't think we're
      missing anything protocol-wise; this seems to be a failing of the
      implementations themselves.<br>
      <br>
      I think that's the vast majority of what you need to worry about
      in terms of the core SIP protocol. Now, there are some protocols
      we use (e.g., BFCP, TLS, CCMP, S/MIME) that we would rely on
      having sufficient internationalization support, but I would be
      inclined to consider those a separable effort.<br>
      <br>
      In any case, if you can find enough critical mass of people with
      the energy and time to move this work forward, I would welcome it
      wholeheartedly. I believe that, the way the charter is currently
      written, this work is likely to fall under the purview of the
      SIPCORE working group.<br>
      <br>
      /a<br>
      <br>
      <br>
      On 5/10/13 06:08, Jonathan Hansford wrote:<br>
    </div>
    <blockquote
      cite="mid:984edebb3d71943ddd13940a3ea1b148@imap.plus.net"
      type="cite">
      <p>Hi,</p>
      <p>I am currently looking at a number of Internet protocols for
        international use and am looking to see how much commonality
        there is between them. A number are, or are in the process of
        becoming, IDNA2008 aware (e.g. DNS - RFC 5890, SMTP - RFC
        6530/1, XMPP - draft-ietf-xmpp-6122bis-07).</p>
      <p>I have been trying to identify what support for
        internationalization there is within SIP and can find no
        reference to it. Can you advise what level of support (if any)
        SIP currently provides for countries whose native language is
        not (adequately) supported by US ASCII and/or whether there are
        any plans to address this in the future?</p>
      <p>Thanks,</p>
      <p>Jonathan Hansford</p>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
sipcore mailing list
<a class="moz-txt-link-abbreviated" href="mailto:sipcore@ietf.org">sipcore@ietf.org</a>
<a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/sipcore">https://www.ietf.org/mailman/listinfo/sipcore</a>
</pre>
    </blockquote>
    <br>
  </body>
</html>

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Hi Adam, a few corrections and amplifications inline.

On 5/10/13 10:16 AM, Adam Roach wrote:
> Jonathan:
> 
> As far as I know, there has been no serious work on SIP's i18n
> story so far. The closest we come is the use of UTF-8 everywhere.
> While an international character encoding is a necessary part of
> the story, it's far from sufficient.
> 
> I've known for quite some time that SIP's IDN story is conspicuous
> by its absence. I've never really had the time to poke at
> existing, deployed implementations to see what they do when you
> feed unicode characters into domain names. Given the lack of
> specification, I doubt most of them do anything useful. Some might
> accidentally kind of work, depending on what punycode support their
> underlying DNS libraries provide, but the chances of this being
> done in a way that yields success seems extremely slim.

It's not just punycode (RFC 3492) but the framework that re-uses
punycode. The original framework was IDNA2003 (RFC 3490), which has
been superseded by RFCs 5890-5894. However, the world is migrating to
IDNA2008 in a rather slow fashion, so many applications still use
IDNA2003.

> The other area we need to worry about, as Gunnar and Peter hinted
> at, is usernames. The big issue here (as I understand it) is the
> application of stringprep for the purpose of measuring username
> equality.

IDNA2003 used stringprep, which was tied to Unicode 3.2 (the current
version is 6.2). IDNA2008 ditched stringprep so that it could be agile
with respect to Unicode versions. The PRECIS WG is doing the same for
non-DNS identifiers.

> I'd been keeping my eyes, very loosely, on the IRI work in hope
> that we could leverage its output in a future SIP
> internationalization effort, since it would hopefully provide
> guidance on both the IDN and stringprep issues. Sadly, that work
> seems to have been terminated before producing useful output, so
> we'll have to make our own way through this morass.

The IRI WG was trying to update RFC 3987, but that effort ran out of
steam. However, RFC 3987 still exists and is usable.

> There are probably some similar issues for password normalization, 
> although I'm not sure that's as much of an issue, since passwords,
> by their nature, are generated in a more repeatable way than
> usernames are. I would expect that people who have spent far more
> time than I have thinking about the problem have some ideas here.

See RFC 4103 (SASLprep) and draft-ietf-precis-saslprepbis.

Peter

- -- 
Peter Saint-Andre
https://stpeter.im/


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On 5/10/13 11:08 AM, Peter Saint-Andre wrote:

> See RFC 4103 (SASLprep) and draft-ietf-precis-saslprepbis.

Er, RFC 4013.

/psa
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From worley@shell01.TheWorld.com  Fri May 10 11:14:56 2013
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Subject: Re: [sipcore] SIP and Internationalisation
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> From: Jonathan Hansford <Jonathan@hansfords.net>
> 
> I have been trying to identify what
> support for internationalization there is within SIP and can find no
> reference to it. Can you advise what level of support (if any) SIP
> currently provides for countries whose native language is not
> (adequately) supported by US ASCII and/or whether there are any plans to
> address this in the future? 

Here's the state of SIP practice that I see:

There isn't much of SIP that is visible to the user, so little of it
has internationalization concerns.

As far as I know, the most significant area is the "name-addr"
construction, which is the enhanced URI that is used to address phone
calls.  That is often used at the receiving phone to display the
caller's name a phone number.  Typical use is something like:

      INVITE sip:bob@biloxi.com SIP/2.0
      From: Alice <sip:alice@atlanta.com>;tag=1928301774
      To: Bob <sip:bob@biloxi.com>

The display-name part, "Alice" and "Bob" is defined to be a series of
UTF-8-encoded Unicode characters (with certain restrictions), so it is
already fully internationalized.  It also has the virtue that while
the protocol carries it, the protocol doesn't *interpret* it.

The protocol treats URIs (e.g., sip:bob@biloxi.com) as sequences of
Unicode characters with very limited variation allowed before one URI
becomes "different" from another.  Generally, we do not expect users
to enter URIs or interpret them, but rather select entries from
address books.

The domain name part (atlanta.com) is part of the URI, and so is
restricted to Ascii characters.  But we have a system for encoding
non-Ascii domain names into Ascii characters.  I'm not familiar with
the details, but it's the same problem as encoding non-Ascii domain
names into HTTP URLs.

The part that is least well worked out (IMO) is the user-part of the
SIP URI; in these examples, "bob" and "alice".  As part of a URI,
user-parts have to be composed of Ascii characters, but there is an
escaping system, where instead of an ordinary character you write
"%xx", where "xx" is two hex digits.

It turns out that what the escape *means* is not well specified, other
than that if you replace a syntactically acceptable Ascii character
with its hex escape, the resulting URI must compare equal to the
original URI.  But it seems that there is an intention that a
non-Ascii character can be represented by writing a series of escapes
representing the bytes in the character's UTF-8 representation.  But
it's likely that at least some systems use the escapes %80 to %FF to
represent the characters U+0080 to U+00FF.

Dale

From pkyzivat@alum.mit.edu  Fri May 10 12:14:39 2013
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Subject: Re: [sipcore] SIP and Internationalisation
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I'll echo Adam, but admit that I know very little about 
internationalization - clearly less than Adam, much less Peter.

I do know enough to recognize that there is something lacking.
If we have a volunteer with the knowledge and motivation to work on it, 
then we should be be able to support the work within sipcore.

I expect this hasn't surfaced as much of a problem because most of the 
use of sip is with phone numbers.

	Thanks,
	Paul

On 5/10/13 12:16 PM, Adam Roach wrote:
> Jonathan:
>
> As far as I know, there has been no serious work on SIP's i18n story so
> far. The closest we come is the use of UTF-8 everywhere. While an
> international character encoding is a necessary part of the story, it's
> far from sufficient.
>
> I've known for quite some time that SIP's IDN story is conspicuous by
> its absence. I've never really had the time to poke at existing,
> deployed implementations to see what they do when you feed unicode
> characters into domain names. Given the lack of specification, I doubt
> most of them do anything useful. Some might accidentally kind of work,
> depending on what punycode support their underlying DNS libraries
> provide, but the chances of this being done in a way that yields success
> seems extremely slim.
>
> The other area we need to worry about, as Gunnar and Peter hinted at, is
> usernames. The big issue here (as I understand it) is the application of
> stringprep for the purpose of measuring username equality.
>
> I'd been keeping my eyes, very loosely, on the IRI work in hope that we
> could leverage its output in a future SIP internationalization effort,
> since it would hopefully provide guidance on both the IDN and stringprep
> issues. Sadly, that work seems to have been terminated before producing
> useful output, so we'll have to make our own way through this morass.
>
> There are probably some similar issues for password normalization,
> although I'm not sure that's as much of an issue, since passwords, by
> their nature, are generated in a more repeatable way than usernames are.
> I would expect that people who have spent far more time than I have
> thinking about the problem have some ideas here.
>
> Aside from URIs and Digest credentials, there is mercifully little in
> the way of protocol fields intended to be user-visible for SIP. A
> handful, like Organization and Subject, were specified in a way that
> implied that they should be user-renderable; however, in practice, no
> one ever uses these fields (and, in any case, I don't think they pose
> any particular i18n challenges, as these fields are not
> machine-interpretable, and do allow UTF-8 characters).
>
> In practice, most implementations them do a lousy job of l10n (e.g. for
> response Reason-Phrases) , but I don't think we're missing anything
> protocol-wise; this seems to be a failing of the implementations themselves.
>
> I think that's the vast majority of what you need to worry about in
> terms of the core SIP protocol. Now, there are some protocols we use
> (e.g., BFCP, TLS, CCMP, S/MIME) that we would rely on having sufficient
> internationalization support, but I would be inclined to consider those
> a separable effort.
>
> In any case, if you can find enough critical mass of people with the
> energy and time to move this work forward, I would welcome it
> wholeheartedly. I believe that, the way the charter is currently
> written, this work is likely to fall under the purview of the SIPCORE
> working group.
>
> /a
>
>
> On 5/10/13 06:08, Jonathan Hansford wrote:
>>
>> Hi,
>>
>> I am currently looking at a number of Internet protocols for
>> international use and am looking to see how much commonality there is
>> between them. A number are, or are in the process of becoming,
>> IDNA2008 aware (e.g. DNS - RFC 5890, SMTP - RFC 6530/1, XMPP -
>> draft-ietf-xmpp-6122bis-07).
>>
>> I have been trying to identify what support for internationalization
>> there is within SIP and can find no reference to it. Can you advise
>> what level of support (if any) SIP currently provides for countries
>> whose native language is not (adequately) supported by US ASCII and/or
>> whether there are any plans to address this in the future?
>>
>> Thanks,
>>
>> Jonathan Hansford
>>
>>
>>
>> _______________________________________________
>> sipcore mailing list
>> sipcore@ietf.org
>> https://www.ietf.org/mailman/listinfo/sipcore
>
>
>
> _______________________________________________
> sipcore mailing list
> sipcore@ietf.org
> https://www.ietf.org/mailman/listinfo/sipcore
>


From stpeter@stpeter.im  Fri May 10 14:40:45 2013
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On 5/10/13 1:14 PM, Paul Kyzivat wrote:
> I'll echo Adam, but admit that I know very little about
> internationalization - clearly less than Adam, much less Peter.
> 
> I do know enough to recognize that there is something lacking.
> If we have a volunteer with the knowledge and motivation to work on it,
> then we should be be able to support the work within sipcore.

I doubt that we'll find a volunteer with both the motivation and the
knowledge. Instead, I expect that we'll need to find someone with the
motivation and then train that person to have the knowledge. In the XMPP
community, Joe Hildebrand and I had to train ourselves (with much help
from more knowledgeable people like Pete Resnick). There is a lot to
learn in this space (personally I feel like I'm still scratching the
surface), and the motivation will need to be accompanied by the
willingness to do a great deal of self-learning.

> I expect this hasn't surfaced as much of a problem because most of the
> use of sip is with phone numbers.

Probably so.

Peter

-- 
Peter Saint-Andre
https://stpeter.im/



From tsearle@sipstacks.com  Mon May 13 00:34:56 2013
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Date: Mon, 13 May 2013 09:34:55 +0200
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Subject: Re: [sipcore] SIP and Internationalisation
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--089e0139fffc92b09e04dc948da5
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If I understand correctly, the domain name part does have a significant
problem as it's defined as follows:

 ALPHA          =  %x41-5A / %x61-7A   ; A-Z / a-z

hostport         =  host [ ":" port ]
host             =  hostname / IPv4address / IPv6reference
hostname         =  *( domainlabel "." ) toplabel [ "." ]
domainlabel      =  alphanum
                    / alphanum *( alphanum / "-" ) alphanum


Which would prevent the newer domain names in non-latin alphabets from
being legally used in SIP.  Or would SIP require the use of the "ToAscii"
format defined rfc3490?



On Fri, May 10, 2013 at 11:40 PM, Peter Saint-Andre <stpeter@stpeter.im>wrote:

> On 5/10/13 1:14 PM, Paul Kyzivat wrote:
> > I'll echo Adam, but admit that I know very little about
> > internationalization - clearly less than Adam, much less Peter.
> >
> > I do know enough to recognize that there is something lacking.
> > If we have a volunteer with the knowledge and motivation to work on it,
> > then we should be be able to support the work within sipcore.
>
> I doubt that we'll find a volunteer with both the motivation and the
> knowledge. Instead, I expect that we'll need to find someone with the
> motivation and then train that person to have the knowledge. In the XMPP
> community, Joe Hildebrand and I had to train ourselves (with much help
> from more knowledgeable people like Pete Resnick). There is a lot to
> learn in this space (personally I feel like I'm still scratching the
> surface), and the motivation will need to be accompanied by the
> willingness to do a great deal of self-learning.
>
> > I expect this hasn't surfaced as much of a problem because most of the
> > use of sip is with phone numbers.
>
> Probably so.
>
> Peter
>
> --
> Peter Saint-Andre
> https://stpeter.im/
>
>
> _______________________________________________
> sipcore mailing list
> sipcore@ietf.org
> https://www.ietf.org/mailman/listinfo/sipcore
>

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<div dir=3D"ltr">If I understand correctly, the domain name part does have =
a significant problem as it&#39;s defined as follows:<br><br><div>=A0ALPHA =
=A0 =A0 =A0 =A0 =A0=3D =A0%x41-5A / %x61-7A =A0 ; A-Z / a-z<br></div><div><=
br></div><div><div>
hostport =A0 =A0 =A0 =A0 =3D =A0host [ &quot;:&quot; port ]</div><div>host =
=A0 =A0 =A0 =A0 =A0 =A0 =3D =A0hostname / IPv4address / IPv6reference</div>=
<div>hostname =A0 =A0 =A0 =A0 =3D =A0*( domainlabel &quot;.&quot; ) toplabe=
l [ &quot;.&quot; ]</div><div>domainlabel =A0 =A0 =A0=3D =A0alphanum</div>
<div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 / alphanum *( alphanum / &quot=
;-&quot; ) alphanum</div><div><br></div></div><div><br></div><div style>Whi=
ch would prevent the newer domain names in non-latin alphabets from being l=
egally used in SIP. =A0Or would SIP require the use of the &quot;ToAscii&qu=
ot; format defined rfc3490?</div>
<div><br></div></div><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Fri, May 10, 2013 at 11:40 PM, Peter Saint-Andre <span dir=3D"lt=
r">&lt;<a href=3D"mailto:stpeter@stpeter.im" target=3D"_blank">stpeter@stpe=
ter.im</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div class=3D"im">On 5/10/13 1:14 PM, Paul K=
yzivat wrote:<br>
&gt; I&#39;ll echo Adam, but admit that I know very little about<br>
&gt; internationalization - clearly less than Adam, much less Peter.<br>
&gt;<br>
&gt; I do know enough to recognize that there is something lacking.<br>
&gt; If we have a volunteer with the knowledge and motivation to work on it=
,<br>
&gt; then we should be be able to support the work within sipcore.<br>
<br>
</div>I doubt that we&#39;ll find a volunteer with both the motivation and =
the<br>
knowledge. Instead, I expect that we&#39;ll need to find someone with the<b=
r>
motivation and then train that person to have the knowledge. In the XMPP<br=
>
community, Joe Hildebrand and I had to train ourselves (with much help<br>
from more knowledgeable people like Pete Resnick). There is a lot to<br>
learn in this space (personally I feel like I&#39;m still scratching the<br=
>
surface), and the motivation will need to be accompanied by the<br>
willingness to do a great deal of self-learning.<br>
<div class=3D"im"><br>
&gt; I expect this hasn&#39;t surfaced as much of a problem because most of=
 the<br>
&gt; use of sip is with phone numbers.<br>
<br>
</div>Probably so.<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
Peter<br>
</font></span><div class=3D"im HOEnZb"><br>
--<br>
Peter Saint-Andre<br>
<a href=3D"https://stpeter.im/" target=3D"_blank">https://stpeter.im/</a><b=
r>
<br>
<br>
</div><div class=3D"HOEnZb"><div class=3D"h5">_____________________________=
__________________<br>
sipcore mailing list<br>
<a href=3D"mailto:sipcore@ietf.org">sipcore@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/sipcore" target=3D"_blank"=
>https://www.ietf.org/mailman/listinfo/sipcore</a><br>
</div></div></blockquote></div><br></div>

--089e0139fffc92b09e04dc948da5--

From stpeter@stpeter.im  Mon May 13 05:24:31 2013
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Subject: Re: [sipcore] SIP and Internationalisation
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On 5/13/13 1:34 AM, Torrey Searle wrote:
> If I understand correctly, the domain name part does have a significant
> problem as it's defined as follows:
> 
>  ALPHA          =  %x41-5A / %x61-7A   ; A-Z / a-z
> 
> hostport         =  host [ ":" port ]
> host             =  hostname / IPv4address / IPv6reference
> hostname         =  *( domainlabel "." ) toplabel [ "." ]
> domainlabel      =  alphanum
>                     / alphanum *( alphanum / "-" ) alphanum
> 
> 
> Which would prevent the newer domain names in non-latin alphabets from
> being legally used in SIP.  Or would SIP require the use of the
> "ToAscii" format defined rfc3490?

Yes, it would require the punycoded form (an A-label in RFC 5890).

Peter

-- 
Peter Saint-Andre
https://stpeter.im/



From wwwrun@rfc-editor.org  Fri May 17 12:33:15 2013
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From: RFC Errata System <rfc-editor@rfc-editor.org>
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Subject: [sipcore] [Editorial Errata Reported] RFC6878 (3628)
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The following errata report has been submitted for RFC6878,
"IANA Registry for the Session Initiation Protocol (SIP) "Priority" Header Field".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata_search.php?rfc=6878&eid=3628

--------------------------------------
Type: Editorial
Reported by: Lawrence Jovellanos <lawrence.jovellanos@gmail.com>

Section: 2

Original Text
-------------
This policy was chosen over lighter-weight policies due the potential architectural impact of the semantics associated with new values.

Corrected Text
--------------
This policy was chosen over lighter-weight policies due to the potential architectural impact of the semantics associated with new values.

Notes
-----


Instructions:
-------------
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use "Reply All" to discuss whether it should be verified or
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can log in to change the status and edit the report, if necessary. 

--------------------------------------
RFC6878 (draft-ietf-sipcore-priority-00)
--------------------------------------
Title               : IANA Registry for the Session Initiation Protocol (SIP) "Priority" Header Field
Publication Date    : March 2013
Author(s)           : A.B. Roach
Category            : PROPOSED STANDARD
Source              : Session Initiation Protocol Core
Area                : Real-time Applications and Infrastructure
Stream              : IETF
Verifying Party     : IESG

From gonzalo.camarillo@ericsson.com  Wed May 22 22:39:38 2013
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Subject: Re: [sipcore] [Editorial Errata Reported] RFC6878 (3628)
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Hi,

I have just moved this erratum to the "held for document update" state,
per the errata handling guidelines.

Cheers,

Gonzalo

On 17/05/2013 10:32 PM, RFC Errata System wrote:
> The following errata report has been submitted for RFC6878,
> "IANA Registry for the Session Initiation Protocol (SIP) "Priority" Header Field".
> 
> --------------------------------------
> You may review the report below and at:
> http://www.rfc-editor.org/errata_search.php?rfc=6878&eid=3628
> 
> --------------------------------------
> Type: Editorial
> Reported by: Lawrence Jovellanos <lawrence.jovellanos@gmail.com>
> 
> Section: 2
> 
> Original Text
> -------------
> This policy was chosen over lighter-weight policies due the potential architectural impact of the semantics associated with new values.
> 
> Corrected Text
> --------------
> This policy was chosen over lighter-weight policies due to the potential architectural impact of the semantics associated with new values.
> 
> Notes
> -----
> 
> 
> Instructions:
> -------------
> This errata is currently posted as "Reported". If necessary, please
> use "Reply All" to discuss whether it should be verified or
> rejected. When a decision is reached, the verifying party (IESG)
> can log in to change the status and edit the report, if necessary. 
> 
> --------------------------------------
> RFC6878 (draft-ietf-sipcore-priority-00)
> --------------------------------------
> Title               : IANA Registry for the Session Initiation Protocol (SIP) "Priority" Header Field
> Publication Date    : March 2013
> Author(s)           : A.B. Roach
> Category            : PROPOSED STANDARD
> Source              : Session Initiation Protocol Core
> Area                : Real-time Applications and Infrastructure
> Stream              : IETF
> Verifying Party     : IESG
> 
> 

