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Date: Mon, 4 Sep 2000 09:48:42 +0200
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Subject: [SPIRITS] More on SPIRITS requirements
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Hi SPIRITS colleagues,

I have been thinking into Igor's questions, and  Lawrence's I-D and I h=
ave
some ideas to
share with you. Please, feel free to send your comments and suggestions=
 .

1) TDPs setting (Igor's question).

According to the ITU-T standards, the SMS could be used to set the desi=
red
TDPs in the
SSPs.  However, the SMSs from some suppliers are not able to do so. In =
some
cases an access
to the SSP is done via a different nodes (e.g. used for operation and
maintenance of the switch).

I think we should let this as an implementation option.

The requirement is that there exists a way to set the desired TDP in th=
e
correct SSF(s). This should
be preferrably started from the SPIRITS Server (e.g. when the subscribe=
r
activates ICW
subscription).


2) CAMEL DPs in SPIRITS (Igor's suggestion).

I am not sure if we should add CAMEL DPs in the SPIRITS requirements.

In CAMEL phase 3, several types of "calls" are covered:

  a) Voice Calls. In this case no new DP is needed since CAMEL DPs are
included in CS2. The only
  special case is the "Not Reachable" case which is mapped as a special=

cause in the Busy DP.
  Since we would receive the Busy DP parameters (if a SPIRITS service h=
as
subscribed to Busy),
  we would be able to distinguish a busy from a not reachable situation=
 .

  b) USSD. This is not a PSTN call so it does not apply to SPIRITS.

  c) GPRS. Same comment.

  d) SMS. Same comment.

  e) Mobility Management.

  This could allow a SPIRITS server to be notified in changed of locati=
on
of a mobile user. However,
  triggering of these type of services is not based on DPs, but in a
subscription mark in the HLR.

  Adding this to SPIRITS, means:

    i) Adding a requirement to allow setting subscription marks in the
subscriber's HLR. This is
    equivalent to setting TDPs in the SSP (but in this case M-CSI is se=
t in
the HLR).
    ii) Mapping the CAMEL specific operations into events notification =
to
the SPIRITS client. Since
    the SCP receives the information about the mobility state, this
involves the C interface (is just
    an extension of the DP notification).

  I think this is useful for mobile networks and should be added to the=

requirements. What do you
  think ?.

  The events (not DPs!) which could be notified are:

  - Location Update in the same VLR service area.
  - Location Update in another VLR service area.
  - IMSI attach.
  - MS initiated IMSI detach.
  - Network initiated IMSI detach.

  f) Supplementary Services Notification.

  This mechanism could allow a SPIRITS server to be aware of a subscrib=
er
having invoked one
  of the following supplementary services: Explicit Call Transfer, Call=

Deflection, Call Completion
  on Busy Subscriber or Multi-Party.

  It is also based on subscriptions marks in the HLR, but in this case =
I do
not think this information
  can be used for SPIRITS services.

3) Lawrence Conroy's I-D.

I think he has done a good job describing possible actions performed by=
 a
SPIRITS server. He
has gone beyond what is needed for the SPIRITS benchmark services, but =
this
can make SPIRITS
be usable for more complicated services.

Specifically, in what I have called "Disposition", he has added much mo=
re
(like leg handling for VoIP
calls).

The most complicated requirements are the ones related to VoIP calls (t=
he
rest are either included in
our ideas or are easily mapped into CS2 operations). I am not a VoIP
expert, but in the protocol in
interface C, probably just indicating that the call is to be connected
using VoIP would be enough.
This would leave complexity in the implementations side.

Using multi-leg handling will require a mechanism to identify the calls=

legs. This will require a new
parameter (leg id) for the SUBSCRIBE message.

In the next attachment, I have reviewed the SPIRITS actions proposed by=

Lawrence and tried to
match them into requirements for SPIRITS protocol (following Igor's I-D=

notation).

(See attached file: comments_to_draft-conroy-spirits-act-00.txt)

Kind Regards and sorry for the long email.

Jorge Gat=F3
Airtel M=F3vil




Igor Faynberg <faynberg@bell-labs.com> con fecha 29/07/2000 02:09:20
Asunto:   Re: [SPIRITS] IN- and PINT-related Requirements for SPIRITS
          Protocol


Jorge,

First of all, I forgot to answer your question:

jgato@airtel.es wrote:
>
>
> I understand that the option of accepting the call with VoIP is outsi=
de
> SPIRITS
> and should not be included here, but still we might want to add an op=
tion
> to the
> Accept Call case to indicate VoIP. What do you think ?

Yes, we should definitely include that in the requirements. Let us see =
if
the
chairmen allow us. I will ask that question at the meeting.

Second, I just put together the viewgraphs on the new issues (with a fu=
ll
acknowledgement to you), which I am attaching.

Between you and me, I still don't understand how you think we could set=

TDPs if
that is to be done by SMS, but we will need to talk about that.
I also wonder if you are interested in adding Wireless DPs (from UMTS o=
r
Camel),
so please let me know. Other than that, I think wea re in full agreemen=
t,
and
your material is very valuable for the Requirements RFC. (Let us do
protocol
too?)

Igor


=

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Jorge, Igor,

Good ideas! please see my comments inline.

-Alec

jgato@airtel.es wrote:

> Hi SPIRITS colleagues,
>
> I have been thinking into Igor's questions, and  Lawrence's I-D and I have
> some ideas to
> share with you. Please, feel free to send your comments and suggestions .
>
> 1) TDPs setting (Igor's question).
>
> According to the ITU-T standards, the SMS could be used to set the desired
> TDPs in the
> SSPs.  However, the SMSs from some suppliers are not able to do so. In some
> cases an access
> to the SSP is done via a different nodes (e.g. used for operation and
> maintenance of the switch).
>
> I think we should let this as an implementation option.

Agree, this would be the most advisable, unless there is a clear need to have this standardized.

>
> ...
>
> 2) CAMEL DPs in SPIRITS (Igor's suggestion).
>
> I am not sure if we should add CAMEL DPs in the SPIRITS requirements.
>
> In CAMEL phase 3, several types of "calls" are covered:
>
>   a) Voice Calls. In this case no new DP is needed since CAMEL DPs are
> included in CS2. The only
>   special case is the "Not Reachable" case which is mapped as a special
> cause in the Busy DP.
>   Since we would receive the Busy DP parameters (if a SPIRITS service has
> subscribed to Busy),
>   we would be able to distinguish a busy from a not reachable situation .
>
>   b) USSD. This is not a PSTN call so it does not apply to SPIRITS.
>
>   c) GPRS. Same comment.
>
>   d) SMS. Same comment.
>
>   e) Mobility Management.
>
>   This could allow a SPIRITS server to be notified in changed of location
> of a mobile user.

This is VERY important and can be a building block for a whole slew of SPIRITS services.

> However,
>   triggering of these type of services is not based on DPs, but in a
> subscription mark in the HLR.
>

I would like to start a discussion on this. Can we look at the Subscription Mark in the HLR (IN network
element) as "sort of DP"?

>   Adding this to SPIRITS, means:
>
>     i) Adding a requirement to allow setting subscription marks in the
> subscriber's HLR. This is
>     equivalent to setting TDPs in the SSP (but in this case M-CSI is set in
> the HLR).
>     ii) Mapping the CAMEL specific operations into events notification to
> the SPIRITS client. Since
>     the SCP receives the information about the mobility state, this
> involves the C interface (is just
>     an extension of the DP notification).
>
>   I think this is useful for mobile networks and should be added to the
> requirements. What do you
>   think ?.

I am for this assuming that it can pass the "Charter Test".

>
>
>   The events (not DPs!) which could be notified are:
>
>   - Location Update in the same VLR service area.
>   - Location Update in another VLR service area.
>   - IMSI attach.
>   - MS initiated IMSI detach.
>   - Network initiated IMSI detach.
>

Love this list!

>
>   f) Supplementary Services Notification.
>
>   This mechanism could allow a SPIRITS server to be aware of a subscriber
> having invoked one
>   of the following supplementary services: Explicit Call Transfer, Call
> Deflection, Call Completion
>   on Busy Subscriber or Multi-Party.
>
>   It is also based on subscriptions marks in the HLR, but in this case I do
> not think this information
>   can be used for SPIRITS services.
>
> 3) Lawrence Conroy's I-D.
>
> I think he has done a good job describing possible actions performed by a
> SPIRITS server. He
> has gone beyond what is needed for the SPIRITS benchmark services, but this
> can make SPIRITS
> be usable for more complicated services.
>
> Specifically, in what I have called "Disposition", he has added much more
> (like leg handling for VoIP
> calls).
>
> The most complicated requirements are the ones related to VoIP calls (the
> rest are either included in
> our ideas or are easily mapped into CS2 operations). I am not a VoIP
> expert, but in the protocol in
> interface C, probably just indicating that the call is to be connected
> using VoIP would be enough.
> This would leave complexity in the implementations side.
>
> Using multi-leg handling will require a mechanism to identify the calls
> legs. This will require a new
> parameter (leg id) for the SUBSCRIBE message.
>
> In the next attachment, I have reviewed the SPIRITS actions proposed by
> Lawrence and tried to
> match them into requirements for SPIRITS protocol (following Igor's I-D
> notation).
>
> (See attached file: comments_to_draft-conroy-spirits-act-00.txt)
>
> Kind Regards and sorry for the long email.
>
> Jorge Gató
> Airtel Móvil
>
> Igor Faynberg <faynberg@bell-labs.com> con fecha 29/07/2000 02:09:20
> Asunto:   Re: [SPIRITS] IN- and PINT-related Requirements for SPIRITS
>           Protocol
>
> Jorge,
>
> First of all, I forgot to answer your question:
>
> jgato@airtel.es wrote:
> >
> >
> > I understand that the option of accepting the call with VoIP is outside
> > SPIRITS
> > and should not be included here, but still we might want to add an option
> > to the
> > Accept Call case to indicate VoIP. What do you think ?
>
> Yes, we should definitely include that in the requirements. Let us see if
> the
> chairmen allow us. I will ask that question at the meeting.
>
> Second, I just put together the viewgraphs on the new issues (with a full
> acknowledgement to you), which I am attaching.
>
> Between you and me, I still don't understand how you think we could set
> TDPs if
> that is to be done by SMS, but we will need to talk about that.
> I also wonder if you are interested in adding Wireless DPs (from UMTS or
> Camel),
> so please let me know. Other than that, I think wea re in full agreement,
> and
> your material is very valuable for the Requirements RFC. (Let us do
> protocol
> too?)
>
> Igor
>
>   ------------------------------------------------------------------------
>                                                      Name: comments to draft-conroy-spirits-act-00.txt
>    comments to draft-conroy-spirits-act-00.txt       Type: Plain Text (text/plain)
>                                                  Encoding: base64
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Jorge, Igor,

There is something else:

jgato@airtel.es wrote:

> ...
>
> Specifically, in what I have called "Disposition", he [Lawrence Conroy] has added much more
> (like leg handling for VoIP
> calls).
> ...

Please, let us not go again into that area of VOIP. This is NOT what SPIRITS is about!
Lawrence is aware of that more than anyone else on this list and stated precisely that in his talk last
meeting in Pittsburgh..

Regards,
Alec

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From spirits-admin@lists.bell-labs.com  Tue Sep  5 15:54:05 2000
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Dear listmates,

According to the attached 'IESG guidance on the moderation of IETF
Working Group Mailing Lists' and with the AD approval I am posting the
following SPIRITS mailing list moderation policy:

1. The primary purpose of this Moderation Policy is to prevent obvious
spam from being posted.

2. To achieve this, postings from non-members mail accounts will be
individually screened. That may result in some delay.

3. Any message with non-ASCII attachment will be rejected.

Regards,
Alec

-------- Original Message --------
Subject: IESG Statement on WG Moderated Lists (fwd)
Date: Tue, 5 Sep 2000 09:58:17 -0400 (Eastern Daylight Time)
From: Steve Coya <scoya@ietf.org>
To: wgchairs@ietf.org


The third of three


---------- Forwarded message ----------
Date: Tue, 29 Aug 2000 08:33:03 -0400
From: Fred Baker <chair@ietf.org>
To: IETF-Announce:  ;
Subject: IESG Statement on WG Moderated Lists


  IESG guidance on the moderation of IETF Working Group Mailing Lists

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Dear Good SPIRITED listmates,

The best way to assess the status of the WG is to look how well it is
adhering to its Charter and completing its milestones. Let us take a
look at the SPIRITS milestones progress:

On August 14 the  I-D "Pre-Spirits Implementations of PSTN-initiated
Services", <draft-ietf-spirits-implementations-01.txt>, our first
milestone, was submited for the IESG approval of its publication as an
Informational RFC.
Congratulations to H. Lu (Editor), I. Faynberg, J. Voelker, M. Weissman,
W. Zhang, S. Rhim, J. Hwang, S. Ago, S. Moeenuddin, S. Hadvani, S.
Nyckelgard, J. Yoakum, L. Robart ! (the names are listed here in the
order they appear in the I-D).
Currently, Hui-Lan is making editorial changes, incorporating AD's
comments, and is preparing the second iteration submission to the IESG.

As a result of our Pittsburgh meeting two architectural proposals: Lev
Slutsman/Igor Faynberg/Jorge Gato and Jörgen Björkner/Sören Nyckelgård
are good candidates for merge. Two parties are working together and will
publish the proposed SPIRITS Architecture on this list for review.

Being driven by converging SPIRITS Architecture there is a set of
SPIRITS Protocol Requirements that is beginning to emerge. Igor
Faynberg, Jorge Gato, Jörgen Björkner and Sören Nyckelgård are leading
this work.

Also, as a result of the Pittsburgh meeting, there are signs that many
of the SPIRITS protocol requirements (interoperability with PINT and IN,
utilizing existing and proven protocol, etc.) are pointing in the SIP
direction. As we said at the meeting, we do not have to agree on SIP at
this moment, however, it is a good item for discussion on this list.

Kind regards,
Steve and Alec

P.S. Igor and Jorge have recently started a very interesting discussion
on CAMEL DPs in SPIRITS.


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Jorge,

I have a few comments and clarifications to add to your email, I have marked
these with **JH in the text below (which is an extract from your orginal email):

Extract of email begins "

1) TDPs setting (Igor's question).

According to the ITU-T standards, the SMS could be used to set the desired
TDPs in the
SSPs.  However, the SMSs from some suppliers are not able to do so. In some
cases an access
to the SSP is done via a different nodes (e.g. used for operation and
maintenance of the switch).


**JH Could you please explain the first sentence, what you mean by the ITU-T
standards (which ones?) and the Short Message Service being used to set
triggers.  First, why and second, which types of SMS, orginating or terminating
or both?  Third, what is the service we are trying to achieve here and finally
what are the restrictions to which you refer?  I am assuming you mean the GSM
SMS.  Unfortunately I did not receive the email from Igor that was dated 29th
July so the context of your response to the questions from Igor is not clear to
me.**JH


I think we should let this as an implementation option.

The requirement is that there exists a way to set the desired TDP in the
correct SSF(s). This should
be preferrably started from the SPIRITS Server (e.g. when the subscriber
activates ICW
subscription).


2) CAMEL DPs in SPIRITS (Igor's suggestion).

I am not sure if we should add CAMEL DPs in the SPIRITS requirements.


**JH I tend to agree with your comment my reasoning being that from the
perspective of voice calls the DPs are just a subset of the ETSI Core INAP CS3
(as you are referring to CAMEL Phase 3 features).  [Note that CAMEL does not use
the DP specific approach but DP generic].  From the SPIRITS perspective, what
service scenarios are being considered??  Is the CAMEL subscriber the SPIRITS
served "user" and where is the CAMEL subscriber located, only in the PSTN?**JH


In CAMEL phase 3, several types of "calls" are covered:

  a) Voice Calls. In this case no new DP is needed since CAMEL DPs are
included in CS2. The only
  special case is the "Not Reachable" case which is mapped as a special
cause in the Busy DP.
  Since we would receive the Busy DP parameters (if a SPIRITS service has
subscribed to Busy),
  we would be able to distinguish a busy from a not reachable situation .

  b) USSD. This is not a PSTN call so it does not apply to SPIRITS.


**JH Just a minor point, the interaction between the SCP and HLR is not IN but
MAP (Mobile Application Part) and the USSD interaction in non call related **JH


  c) GPRS. Same comment.

  d) SMS. Same comment.


**JH Just a minor point, CAMEL Phase 3 only supports triggering for Mobile
Originated SMS, the terminating case will not be supported until the next Phase
of CAMEL.  Also, the SMS can be either via GPRS switched (in which case the
triggering will be located in the SGSN) or MSC Switched (in which case the
triggering will located in the MSC/VLR). **JH


  e) Mobility Management.

  This could allow a SPIRITS server to be notified in changed of location
of a mobile user. However,
  triggering of these type of services is not based on DPs, but in a
subscription mark in the HLR.


**JH  Just a clarification to the above statement, the use of subscription
information in the HLR for triggering CAMEL services is not just restricted to
Mobility Management but all types of "calls" listed above  [Note that the HLR
does not support an IN interface - does this matter for SPIRITS??]**JH


  Adding this to SPIRITS, means:

    i) Adding a requirement to allow setting subscription marks in the
subscriber's HLR. This is
    equivalent to setting TDPs in the SSP (but in this case M-CSI is set in
the HLR).


**JH  I think this is an over simplification.  The HLR is not the SSP, it is the
MSC/VLR  which acts on this subscription information.  These "triggers" are set
by the HLR downloading the Camel Subscription information to the VLR on change
of location, etc.  In the case of Mobility Management, the changing of the M-CSI
in the HLR achieves nothing until the new M-CSI is downloaded to the VLR  where
the triggering will actually occur.  The notifications are sent to the gsmSCF by
the VLR using the MAP protocol and not IN operations.  How do you envisage this
mechanism working in the Spirits environment and what sort of service scenario
are you thinking of??  **JH


    ii) Mapping the CAMEL specific operations into events notification to
the SPIRITS client. Since
    the SCP receives the information about the mobility state, this
involves the C interface (is just
    an extension of the DP notification).


**JH  As stated above the operations are MAP not IN **JH


  I think this is useful for mobile networks and should be added to the
requirements. What do you
  think ?.

  The events (not DPs!) which could be notified are:

  - Location Update in the same VLR service area.
  - Location Update in another VLR service area.
  - IMSI attach.
  - MS initiated IMSI detach.
  - Network initiated IMSI detach.


**JH  How do you envisage this information being used?? I assume you are only
considering mobility of the user within the CS network but perhaps you could
clarify.  I do not believe that these mobility events will have meaning in an IP
domain. **JH



  f) Supplementary Services Notification.

  This mechanism could allow a SPIRITS server to be aware of a subscriber
having invoked one
  of the following supplementary services: Explicit Call Transfer, Call
Deflection, Call Completion
  on Busy Subscriber or Multi-Party.

  It is also based on subscriptions marks in the HLR, but in this case I do
not think this information
  can be used for SPIRITS services.


**JH As with the Mobility Management these events are sent to the gsmSCF via the
MAP protocol from the MSC.  The IN protocol is not used.  **JH


"End of email extract.

Regards

Jane Humphrey
Marconi Communications




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From spirits-admin@lists.bell-labs.com  Thu Sep  7 20:14:06 2000
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Jane,

I believe the message Jorge referred to (anyway, it could be found on in the
archive) is the one in which I was ruminating on  setting DPs and mentioned
TDPs. According to the ITU-T IN standard, this is done by the SMF statically; in
the US Wireless IN standard, I understand it can be done dynamically. So, the
gist of Jorge's reply is that it should be left to implementation. I agree. What
that means is that SPIRITS (or, rather PINT, to be more precise) protocol will
NOT postulate setting TDPs via SPIRITS client/PINT server.

I hope this answers some of your questions. As for the usage of "SMS," I am
absolutely sure Jorge uses it for Service Management System not "Short Message
Service."  Mea culpa: I suspect it was I who set the precedence in SPIRITS for
this usage, which is wide-spread in the US OSS parlance. So SMS is really what
Q.12x4 calls "SMF" (or Q.12x5, "SMP"). Now I think everything is clear.

What is interesting is that the acronyms have become so overloaded ("What is
IP--Internet Protocol or Intelligent Peripheral?" I was recently asked by a
technical editor looking at a PINT picture in which  IP marked BOTH. ) that I
think we ought to use symbols rather than letter combinations. An ingenious
idea: we could use Chinese characters! 

Respectfully,

Igor


Jane Humphrey wrote:
> 
> Jorge,
> 

...

> 
> 
> 1) TDPs setting (Igor's question).
> 
> According to the ITU-T standards, the SMS could be used to set the desired
> TDPs in the
> SSPs.  However, the SMSs from some suppliers are not able to do so. In some
> cases an access
> to the SSP is done via a different nodes (e.g. used for operation and
> maintenance of the switch).
> 
> **JH Could you please explain the first sentence, what you mean by the ITU-T
> standards (which ones?) and the Short Message Service being used to set
> triggers.  First, why and second, which types of SMS, orginating or terminating
> or both?  Third, what is the service we are trying to achieve here and finally
> what are the restrictions to which you refer?  I am assuming you mean the GSM
> SMS.  Unfortunately I did not receive the email from Igor that was dated 29th
> July so the context of your response to the questions from Igor is not clear to
>


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Hi Jane,

Thanks a lot for the comments. I think they are very useful to clarify
many things.

Let me try to clarify as much as I can. I will mark my comments with **JG.

Please, feel free to send as many additional comments you may have.

Regards,

Jorge Gató
Airtel Móvil

Jorge,

I have a few comments and clarifications to add to your email, I have
marked
these with **JH in the text below (which is an extract from your orginal
email):

Extract of email begins "

1) TDPs setting (Igor's question).

According to the ITU-T standards, the SMS could be used to set the desired
TDPs in the
SSPs.  However, the SMSs from some suppliers are not able to do so. In some
cases an access
to the SSP is done via a different nodes (e.g. used for operation and
maintenance of the switch).


**JH Could you please explain the first sentence, what you mean by the
ITU-T
standards (which ones?) and the Short Message Service being used to set
triggers.  First, why and second, which types of SMS, orginating or
terminating
or both?  Third, what is the service we are trying to achieve here and
finally
what are the restrictions to which you refer?  I am assuming you mean the
GSM
SMS.  Unfortunately I did not receive the email from Igor that was dated
29th
July so the context of your response to the questions from Igor is not
clear to
me.**JH

**JG Igor has already clarified this. With SMS I did not mean GSM Short
Message
Service, but Service Management System. This is a name used to refer to the
physical implementation of the Service Management Function (SMF) from IN
ITU-T
standards (Q.12XX).
I apologyse for the confusion this has caused. I do not like using to many
acronyms either (believe it or not)!**JG

I think we should let this as an implementation option.

The requirement is that there exists a way to set the desired TDP in the
correct SSF(s). This should
be preferrably started from the SPIRITS Server (e.g. when the subscriber
activates ICW
subscription).


2) CAMEL DPs in SPIRITS (Igor's suggestion).

I am not sure if we should add CAMEL DPs in the SPIRITS requirements.


**JH I tend to agree with your comment my reasoning being that from the
perspective of voice calls the DPs are just a subset of the ETSI Core INAP
CS3
(as you are referring to CAMEL Phase 3 features).  [Note that CAMEL does
not use
the DP specific approach but DP generic].  From the SPIRITS perspective,
what
service scenarios are being considered??  Is the CAMEL subscriber the
SPIRITS
served "user" and where is the CAMEL subscriber located, only in the PSTN?
**JH

**JG If we base SPIRITS on the benchmark services, nothing from CAMEL is
needed. Thinking about CAMEL is to prepare SPIRITS for future services for
mobile users.
You are right that CAMEL can refer to "circuit" subscribers and "packet"
subscribers (GPRS). I was only thinking about "circuit" subscribers, since
they are like "moving PSTN subscribers".
I must recognise I have not though a lot of specific service scenarios.
The only ones I have considered so far is replacing a fixed PSTN subscriber
with a mobile subscriber in the benchmark services**JG

In CAMEL phase 3, several types of "calls" are covered:

  a) Voice Calls. In this case no new DP is needed since CAMEL DPs are
included in CS2. The only
  special case is the "Not Reachable" case which is mapped as a special
cause in the Busy DP.
  Since we would receive the Busy DP parameters (if a SPIRITS service has
subscribed to Busy),
  we would be able to distinguish a busy from a not reachable situation .

  b) USSD. This is not a PSTN call so it does not apply to SPIRITS.


**JH Just a minor point, the interaction between the SCP and HLR is not IN
but
MAP (Mobile Application Part) and the USSD interaction in non call related
**JH

**JG Yes, you are totally right.**JG

  c) GPRS. Same comment.

  d) SMS. Same comment.


**JH Just a minor point, CAMEL Phase 3 only supports triggering for Mobile
Originated SMS, the terminating case will not be supported until the next
Phase
of CAMEL.  Also, the SMS can be either via GPRS switched (in which case the
triggering will be located in the SGSN) or MSC Switched (in which case the
triggering will located in the MSC/VLR). **JH

**JG Again, you are right.**JG

  e) Mobility Management.

  This could allow a SPIRITS server to be notified in changed of location
of a mobile user. However,
  triggering of these type of services is not based on DPs, but in a
subscription mark in the HLR.


**JH  Just a clarification to the above statement, the use of subscription
information in the HLR for triggering CAMEL services is not just restricted
to
Mobility Management but all types of "calls" listed above  [Note that the
HLR
does not support an IN interface - does this matter for SPIRITS??]**JH

**JG Yes, I did not explain myself very well. What I meant is that the
basic
call (although based on a subscription mark in the HLR O-CSI, T-CSI, etc.)
they
refer to Detection Points (DPs) which can be mapped to the Basic Call State
Models (BCSMs) used for PSTN. However, for Mobility Management this is not
the case (we can say that they are call unrelated).
In regards to the difference between MAP and INAP, I do not think this
should
matter for SPIRITS. In the scenarios we are talking about, both are used to
access the SCP to trigger a service action.
I agree this can affect the SPIRITS architecture and some work would be
needed
there (minor clarification could be enough).**JG

  Adding this to SPIRITS, means:

    i) Adding a requirement to allow setting subscription marks in the
subscriber's HLR. This is
    equivalent to setting TDPs in the SSP (but in this case M-CSI is set in
the HLR).


**JH  I think this is an over simplification.  The HLR is not the SSP, it
is the
MSC/VLR  which acts on this subscription information.  These "triggers" are
set
by the HLR downloading the Camel Subscription information to the VLR on
change
of location, etc.  In the case of Mobility Management, the changing of the
M-CSI
in the HLR achieves nothing until the new M-CSI is downloaded to the VLR
where
the triggering will actually occur.  The notifications are sent to the
gsmSCF by
the VLR using the MAP protocol and not IN operations.  How do you envisage
this
mechanism working in the Spirits environment and what sort of service
scenario
are you thinking of??  **JH

**JG You have explained very well how the Mobility Management triggers
work. I
do not see a difference between setting the M-CSI from a CAMEL Operations
Centre
than from a SPRITS service node. In both cases, the HLR should notify the
VLR
of the new subscriber profile (if I remeber well an InsertSubscriberData
MAP
operation should be sent from the HLR to the VLR).
The service scenario that I see is integrating mobility and location into
SPIRITS service. For example, for Internet Call Waiting, the treatment of
an
incoming call could be "send to my mobile if attached, otherwise take the
call
and release the internet session".**JG

    ii) Mapping the CAMEL specific operations into events notification to
the SPIRITS client. Since
    the SCP receives the information about the mobility state, this
involves the C interface (is just
    an extension of the DP notification).


**JH  As stated above the operations are MAP not IN **JH


**JG Correct.**JG

  I think this is useful for mobile networks and should be added to the
requirements. What do you
  think ?.

  The events (not DPs!) which could be notified are:

  - Location Update in the same VLR service area.
  - Location Update in another VLR service area.
  - IMSI attach.
  - MS initiated IMSI detach.
  - Network initiated IMSI detach.


**JH  How do you envisage this information being used?? I assume you are
only
considering mobility of the user within the CS network but perhaps you
could
clarify.  I do not believe that these mobility events will have meaning in
an IP
domain. **JH


**JG You are right. I only meant "circuit" subscribers. I do not think that
even
SPIRITS apply to "packet" subscribers.

  f) Supplementary Services Notification.

  This mechanism could allow a SPIRITS server to be aware of a subscriber
having invoked one
  of the following supplementary services: Explicit Call Transfer, Call
Deflection, Call Completion
  on Busy Subscriber or Multi-Party.

  It is also based on subscriptions marks in the HLR, but in this case I do
not think this information
  can be used for SPIRITS services.


**JH As with the Mobility Management these events are sent to the gsmSCF
via the
MAP protocol from the MSC.  The IN protocol is not used.  **JH

**JG Correct.**JG

"End of email extract.

Regards

Jane Humphrey
Marconi Communications




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From spirits-admin@lists.bell-labs.com  Thu Sep 21 12:18:18 2000
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Jorge,

I am updating the requirements and I plan to issue the .01 version
tomorrow. I will definitely send you a copy today BEFORE I send it to
the IETF, but so far I just made sure that I put ALL your suggestions
in. 

In any event, I will issue another copy no later than a month from now.

One thing I need from you urgently is your address and telephone number
because I need to put them in the draft.

With best regards,

Igor


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Date: Fri, 22 Sep 2000 07:13:21 -0500
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Dear members of the SPIRITS WG,

Our AD just informed Steve and I that IESG has approved our "Pre-Spirits
Implementations of PSTN-initiated Services" document. We reached our
first WG milestone!
Congratulations to Hui-Lan Lu (Document Editor) and the whole group of
authors!

Regards,
Alec

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