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Ip=[144.230.32.81]; Helo=[preapdm2.corp.sprint.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR05MB3591 Archived-At: Subject: Re: [Dime] draft-avasarala-diameter-error-invalid-identity-00 X-BeenThere: dime@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Diameter Maintanence and Extentions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Nov 2017 14:06:50 -0000 --_006_e7098a2619c14c2ca030af019f1c376aplswe13m04adsprintcom_ Content-Type: multipart/alternative; boundary="_000_e7098a2619c14c2ca030af019f1c376aplswe13m04adsprintcom_" --_000_e7098a2619c14c2ca030af019f1c376aplswe13m04adsprintcom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Tl;dr - Update 29.061 to be consistent with its own statements. Correct al= l documents in 3GPP that do not reference TS 23.003 to use its format for t= his value. Ensure that systems that support multiple protocols, e.g. Diame= ter and SIP understand that conversion is required. ------------------------------ Per 29.061-f00 (which is RADIUS format - not CCF - version of the value tha= t is unceremoniously sent over to the OCS and is usually a bad sign from ti= me to time as it reflects many changes over time which may conflict with ea= ch other): Bits Octets 8 7 6 5 4 3 2 1 1 3GPP Type =3D 20 2 3GPP Length =3D 2+n 3 - (2+n) IMEI(SV) digits 1 - n (UTF-8 encoded characters) 3GPP Type: 20 IMEISV value: Text type. A GGSN receives IMEI(SV) that is encoded according to 3GPP TS 29.060 [24]. = A P-GW receives IMEI(SV) that is encoded in ME Identity IE specified in 3GP= P TS 29.274 [81]. The GGSN or the P-GW converts IMEI(SV) into a sequence o= f UTF-8 characters.IMEI(SV) shall be encoded as defined in 3GPP TS 23.003 [= 40]. 14 * n * 16 n =3D 16 for IMEISV, where TAC =3D 8 digits SNR =3D 6 digits & SVN =3D 2 d= igits; n =3D 15 for IMEI, where TAC =3D 8 digits SNR =3D 6 digits & Spare =3D 1 d= igit; n =3D 14 for IMEI, where TAC =3D 8 digits SNR =3D 6 digits (Spare digit is= not sent) NOTE: IMEI(SV) digits 1 - n (UTF-8 encoded characters) You see the use of the word 'digits' which means we should not see hex valu= es here nor should we see hex values encoded as UTF-8, i.e. an 'A' in UTF-= 8 format. Keep in mind though that given the front matter on this AVP it i= s an OctetString. TS 29.212-e50 is consistent as well on this as it points to RFC 4006 and st= ates "shall be encoded in UTF-8 encoded decimal" For RFC4006bis we are okay as we point to TS 23.003 and TS 29.061 which is = used by many other 3GPP specs for this AVP also pushes to TS 23.003. Then we look @ 23.003 (I'll pick f10 for the sake of randomness here), The International Mobile station Equipment Identity and Software Version Nu= mber (IMEISV) is composed as shown in figure 11. [cid:image002.png@01D352EC.BA02C6E0] Figure 11: Structure of IMEISV The IMEISV is composed of the following elements (each element shall consis= t of decimal digits only): - Type Allocation Code (TAC). Its length is 8 digits; - Serial Number (SNR) is an individual serial number uniquely identifyi= ng each equipment within each TAC. Its length is 6 digits; - Software Version Number (SVN) identifies the software version number = of the mobile equipment. Its length is 2 digits. Regarding updates of the IMEISV: The security requirements of 3GPP TS 22.01= 6 [32] apply only to the TAC and SNR, but not to the SVN part of the IMEISV= . This is a fixed length format (16)! In essence here I believe that the issu= e is 29.061. The statement "The GGSN or the P-GW converts IMEI(SV) into a= sequence of UTF-8 characters.IMEI(SV) shall be encoded as defined in 3GPP= TS 23.003 [40]." Essentially covers the requirement. The sentences BELOW = that and the fact that n is variable is not correct if the value converts t= o 23.003. I would assume @ one point the SV was optional in reality but th= at has appeared to change. Developers using old code or looking at the de= finition in 29.061 can be misleading here to create values that violate 23.= 003. Finally, even if 29.061 was improved (by fixing the length and eliminating = the last 3 lines), there should NEVER be a hex character in these values. = I also checked 23.299 which points back to 23.003 as well. RECOMMENDATION: - 3GPP should probably update the 3GPP-IMEISV length to reflect th= eir own statement about following 23.003 as some of the other statements in= that section MAY conflict with the 23.003 statement. - Look at IMS specs as SIP will likely send this over as hex and e= nsure if they are supporting Diameter that they understand it will use deci= mal representation. The only way to change that would be to change TS 23.0= 03 itself. As 23.003 has the primary function of providing formats across interfaces a= nd boundaries I would urge any specification in 3GPP that is providing valu= e definitions that is not pointing to this document to do so. From: Yuval Lifshitz [mailto:ylifshitz@sandvine.com] Sent: Wednesday, November 01, 2017 1:34 AM To: Bertz, Lyle T [CTO] ; AVASARALA, RANJIT KUMAR = ; dime@ietf.org Cc: Gardella, Maryse (Nokia - FR) (maryse.gardella@nokia.com) ; Yuval Lifshitz Subject: RE: draft-avasarala-diameter-error-invalid-identity-00 Hi Ranjit, Please look at section 7.1.17 (page 99) of the 3GPP/ETSI Gy specification: = http://www.etsi.org/deliver/etsi_ts/132200_132299/132299/14.05.00_60/ts_132= 299v140500p.pdf In that document (which is based on RFC4006) they are specifically addressi= ng the case where User-Equipment-Info is of type IMEI/SV, as well as noting= on the validation of that AVP. Please note that in the specification above, section 7.1.11 (pages 96-97), = domain specific, result codes were added. Would probably be good to propose= the new result code as an enhancement for that spec? This could be a 5xxx or 4xxx result code, depending whether you think that = a retry would resolve the issue. If you think that that would be the way fo= rward with that issue, I would recommend addressing the 3GPP SA5 work group= . Best Regards, Yuval From: Bertz, Lyle T [CTO] [mailto:Lyle.T.Bertz@sprint.com] Sent: Tuesday, October 31, 2017 9:01 PM To: AVASARALA, RANJIT KUMAR; Yuval Lifshitz; dime@ietf.org Subject: RE: draft-avasarala-diameter-error-invalid-identity-00 ty From: AVASARALA, RANJIT KUMAR [mailto:ra698k@att.com] Sent: Tuesday, October 31, 2017 1:57 PM To: Bertz, Lyle T [CTO] >; Yuval Lifshitz >; dime@ietf.org Subject: RE: draft-avasarala-diameter-error-invalid-identity-00 Hi Lyle Answers inline Regards Ranjit VoLTE T4 Support 317-224-9441 From: Bertz, Lyle T [CTO] [mailto:Lyle.T.Bertz@sprint.com] Sent: Tuesday, October 31, 2017 1:46 PM To: AVASARALA, RANJIT KUMAR >; Yuval = Lifshitz >; dime@ietf= .org Subject: RE: draft-avasarala-diameter-error-invalid-identity-00 A few questions: 1. How did a CTF get and invalid IMEI? It is typically pulling from som= ewhere else. invalid iMEI can come from devices reporting invalid IMEI value. = This IMEI value comes from device to MME to PGW and all the way to IMS cor= e. 1. When you say invalid in the spec you reference format. If it is form= at that is doable but if it is questioning data / associations outside of t= he AVP or message then this is problematic. An invalid value in the propo= sal is too vague. Was it a well formed AVP which did not pass some app leve= l semantic check or was it just bad data? by invalid, I mean the data is invalid E.g. the IMEI should be 15 = digits long and should follow the rules defined in RFC 7254/7255. So the C= CF that receives the IMEI should validate the IMEI (which the CCFs currentl= y do not) and once they do, and if they determine that the IMEI is invalid,= then they should insert the error code into Diameter response (E.g. CCA). 1. Is this a IMSI-IMEI(SV) association issue? not association - but the value itself. Technically IMEI and IMEI= SV are same (except for additional value of SV) Lyle From: DiME [mailto:dime-bounces@ietf.org] On Behalf Of AVASARALA, RANJIT KU= MAR Sent: Tuesday, October 31, 2017 1:08 PM To: Yuval Lifshitz >;= dime@ietf.org Subject: Re: [Dime] draft-avasarala-diameter-error-invalid-identity-00 Hi Yuval Thank you for the comments. I agree that a standard diameter error exists - the AVP error. The reason= I proposed invalid mobile identity is - it will be more specific to mobile= identity. It can be changed to a 5xxx - but I want an option for the enti= ty to re-send the request with a valid value (assuming it can) Yes User-Equipment-info AVP is optional in Credit Control Request - but we = have seen it is present most of the times and all the times the value is IM= EI or IMEISV ( though other values can exist) - but in case of VoLTE / IMS = scenarios, the value is usually IMEI. Now we have lot of cases where due to invalid IMEI - the number of bad reco= rds being generated is increasing - so need a way to prevent those. So the proposed solution is for the entities receiving IMEI as part of any = AVP - to validate it and if found invalid to respond with a error. The ent= ity receiving the error has an option to re-send the request with a valid v= alue if it can. Regards Ranjit VoLTE T4 Support 317-224-9441 From: Yuval Lifshitz [mailto:ylifshitz@sandvine.com] Sent: Tuesday, October 31, 2017 12:07 PM To: AVASARALA, RANJIT KUMAR >; dime@i= etf.org Cc: ben@nostrum.com; Yuval Lifshitz > Subject: RE: draft-avasarala-diameter-error-invalid-identity-00 Dear Ranjit, I think there are several issues with your proposal: * A standard diameter error already exists for the case described. It i= s DIAMETER_INVALID_AVP_VALUE (5004) * 3xxx level error codes are meant for peer level (per hop) while the c= ase you describe is session level (end 2 end) * User-Equipment-Info is an optional AVP (at least in RFC4006), and its= payload is not necessarily IMEI or IMEISV. This mean that specification fo= rcing the credit control server to validate it would contradict the existin= g specification Best Regards, Yuval From: DiME [mailto:dime-bounces@ietf.org] On Behalf Of AVASARALA, RANJIT KU= MAR Sent: Tuesday, October 31, 2017 6:32 PM To: dime@ietf.org Cc: ben@nostrum.com Subject: [Dime] draft-avasarala-diameter-error-invalid-identity-00 Hello all We published a new Internet draft addressing the issue of invalid IMEI in S= IP / Diameter requests. Here is the background IMEI is used for uniquely identifying the mobile devices. IMEI is present = in SIP REGISTER request (Contact header) and Diameter CCR Request (user-Equ= ipment-Info AVP). It is always assumed that the IMEI value is correct and= also the entities that receive IMEI usually do not validate the value. This IMEI goes all the way till CCFs which use it as part of records genera= tion that eventually lead to generation of CDRs. So in scenarios where IME= I is correct, the records are considered good but if the IMEI is invalid or= incorrect, then the records that are generated become "bad" and lead to in= consistency in billing. So there is a need to reduce or prevent the generation of bad records and t= his can be done by validating the received IMEI and reporting invalid insta= nces of IMEI. So in order to report the cases of invalid iMEI, this draft proposes a new = diameter protocol error code - DIAMETER_INVALID_MOBILE_IDENTITY We request everyone to review the draft and comment. The URL of the draft is - https://tools.ietf.org/html/draft-avasarala-diame= ter-error-invalid-identity-00.html Regards Ranjit ________________________________ This e-mail may contain Sprint proprietary information intended for the sol= e use of the recipient(s). Any use by others is prohibited. If you are not = the intended recipient, please contact the sender and delete all copies of = the message. --_000_e7098a2619c14c2ca030af019f1c376aplswe13m04adsprintcom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Tl;dr – Update 29.061 to be con= sistent with its own statements.  Correct all documents in 3GPP that d= o not reference TS 23.003 to use its format for this value.  Ensure that systems that support multiple protocols, e.g. Diameter and SIP= understand that conversion is required.

 

------------------------------

Per 29.061-f00 (which is RADIUS forma= t – not CCF - version of the value that is unceremoniously sent over = to the OCS and is usually a bad sign from time to time as it reflects many changes over time which may conflict with each other):=

 

 

Bits

Octets

8

7

6

5

4

3

2

1

1

3GPP Type =3D 20

2

3GPP Length =3D 2+n

3 – (2+n)

IMEI(SV) digits 1 – n (UTF-8 en= coded characters)

 

 

3GPP Type: 20<= /o:p>

IMEISV value: Text type.

A GGSN receives IMEI(SV) that is encoded according t= o 3GPP TS 29.060 [24]. A P-GW receives IMEI(SV) that is encoded i= n ME Identity IE specified in 3GPP TS 29.274 [81]. The GGSN = or the P-GW converts IMEI(SV) into a  sequence of UTF-8 characters.IMEI(SV)= shall be encoded as defined in 3GPP TS 23.003 [40].

14 £= n £ 16

n =3D 16 for IMEISV, where TAC =3D 8 digits  SN= R =3D 6 digits & SVN =3D 2 digits;

n =3D 15 for IMEI, where TAC = =3D 8 digits  SNR =3D 6 digits & Spare =3D 1 digit;

n =3D 14 for IMEI, where TAC =3D 8 digits  SNR = =3D 6 digits (Spare digit is not sent)

 

NOTE:

IMEI(SV) digits 1 – n (UT= F-8 encoded characters)

 

You see the use of the word ‘di= gits’ which means we should not see hex values here  nor should = we see hex values encoded as UTF-8, i.e. an ‘A’ in UTF-8 format= .  Keep in mind though that given the front matter on this AVP it is an Octet= String.

 

TS 29.212-e50 is consistent as well o= n this as it points to RFC 4006 and states “shall be encoded in UTF-8= encoded decimal”

 

For RFC4006bis we are okay as we poin= t to TS 23.003 and TS 29.061 which is used by many other 3GPP specs for thi= s AVP also pushes to TS 23.003.  

 

Then we look @ 23.003 (I’ll pic= k f10 for the sake of randomness here),

The International Mobile station Equipment Identity = and Software Version Number (IMEISV) is composed as shown in figure 11= .

 

Figure 11: Structure of IMEISV

The IMEISV is composed of the following elements (ea= ch element shall consist of decimal digits only):

- Type Allocation Code (TAC). Its length is 8 digits;=

-     Serial Numbe= r (SNR) is an individual serial number uniquely identifying each equipment = within each TAC. Its length is 6 digits;

-     Software Ver= sion Number (SVN) identifies the software version number of the mobile equi= pment. Its length is 2 digits.

Regarding updates of the IMEISV: The security requir= ements of 3GPP TS 22.016 [32] apply only to the TAC and SNR, but not to the= SVN part of the IMEISV.

 

This is a fixed length format (16)! I= n essence here I believe that the issue is 29.061.   The statemen= t “The GGSN or the P-GW converts IMEI(SV) into a  sequence of UTF-8 characters.IMEI(SV)= shall be encoded as defined in 3GPP TS 23.003 [40].” Essentially covers the requirement.  The sentences BELOW that and the fact that n is variable is not correct if the value converts = to 23.003.  I would assume @ one point the SV was optional in reality = but that has appeared to change.   Developers using old code or l= ooking at the definition in 29.061 can be misleading here to create values that violate 23.003. 

 

Finally, even if 29.061 was improved = (by fixing the length and eliminating the last 3 lines), there should NEVER= be a hex character in these values.   I also checked 23.299 which points back to 23.003 as well.

 

RECOMMENDATION:

-   =        3GPP should probably update t= he 3GPP-IMEISV length to reflect their own statement about following 23.003= as some of the other statements in that section MAY conflict with the 23.003 statement.

-   =        Look at IMS specs as SIP will= likely send this over as hex and ensure if they are supporting Diameter th= at they understand it will use decimal representation.  The only way to change that would be to change TS 23.003 itself.

 

As 23.003 has the primary function of= providing formats across interfaces and boundaries I would urge any specif= ication in 3GPP that is providing value definitions that is not pointing to this document to do so.

 

From: Yuval Lifshitz [mailto:ylifshi= tz@sandvine.com]
Sent: Wednesday, November 01, 2017 1:34 AM
To: Bertz, Lyle T [CTO] <Lyle.T.Bertz@sprint.com>; AVASARALA, = RANJIT KUMAR <ra698k@att.com>; dime@ietf.org
Cc: Gardella, Maryse (Nokia - FR) (maryse.gardella@nokia.com) <ma= ryse.gardella@nokia.com>; Yuval Lifshitz <ylifshitz@sandvine.com><= br> Subject: RE: draft-avasarala-diameter-error-invalid-identity-00=

 

Hi Ranjit,

Please look at section 7.1.17 (page 9= 9) of the 3GPP/ETSI Gy specification: http://www.etsi.org/deliver/etsi_ts/132200_132299/132299/14.05.00_60/ts_132= 299v140500p.pdf

In that document (which is based on R= FC4006) they are specifically addressing the case where User-Equipment-Info= is of type IMEI/SV, as well as noting on the validation of that AVP.

Please note that in the specification= above, section 7.1.11 (pages 96-97), domain specific, result codes were ad= ded. Would probably be good to propose the new result code as an enhancement for that spec?

This could be a 5xxx or 4xxx result c= ode, depending whether you think that a retry would resolve the issue. If y= ou think that that would be the way forward with that issue, I would recommend addressing the 3GPP SA5 work group.

 

Best Regards,

 

Yuval

 

 

From: Bertz, Lyle T [CTO] [mailto:Lyle= .T.Bertz@sprint.com]
Sent: Tuesday, October 31, 2017 9:01 PM
To: AVASARALA, RANJIT KUMAR; Yuval Lifshitz; dime@ietf.org
Subject: RE: draft-avasarala-diameter-error-invalid-identity-00=

 

ty

 

From: AVASARALA, RANJIT KUMAR [mailto:ra698k@att.com]
Sent: Tuesday, October 31, 2017 1:57 PM
To: Bertz, Lyle T [CTO] <Lyle.T.Bertz@sprint.com>; Yuval Lifshitz <ylifshitz@sandvine.com>; dime@ietf.org
Subject: RE: draft-avasarala-diameter-error-invalid-identity-00=

 

Hi Lyle

 

Answers inline <Ranjit>

 

Regards

Ranjit

VoLTE T4 Support

317-224-9441

 

 

 

From: Bertz, Lyle T [CTO] [mailto:Lyle.T.Bertz@sprint.com]
Sent: Tuesday, October 31, 2017 1:46 PM
To: AVASARALA, RANJIT KUMAR <ra= 698k@att.com>; Yuval Lifshitz <ylifshitz@sandvine.com>; dime@ietf.org
Subject: RE: draft-avasarala-diameter-error-invalid-identity-00=

 

A few questions:

 

  1. Ho= w did a CTF get and invalid IMEI?  It is typically pulling from somewh= ere else. 

<Ranjit>  invalid iMEI can come from dev= ices reporting invalid IMEI value.  This IMEI value comes from device = to MME to PGW and all the way to IMS core.

  1. Wh= en you say invalid in the spec you reference format.  If it is format = that is doable but if it is questioning data / associations outside of the AVP or message then this is problematic.   An inv= alid value in the proposal is too vague. Was it a well formed AVP which did= not pass some app level semantic check or was it just bad data?=

<Ranjit> by invalid, I mean the data is inval= id E.g. the IMEI should be 15 digits long and should follow the rules defin= ed in RFC 7254/7255.  So the CCF that receives the IMEI should validate the IMEI (which the CCFs currently do not) and once they d= o, and if they determine that the IMEI is invalid, then they should insert = the error code into Diameter response (E.g. CCA).

  1. Is= this a IMSI-IMEI(SV) association issue? 

<Ranjit> not association – but the valu= e itself.  Technically IMEI and IMEISV are same (except for additional= value of SV)

 

Lyle 

 

From: DiME [mailto:dime-bounces@ietf.org] On Behalf Of AVASARALA, RANJIT KUMAR
Sent: Tuesday, October 31, 2017 1:08 PM
To: Yuval Lifshitz <yli= fshitz@sandvine.com>; dime@ietf.org
Subject: Re: [Dime] draft-avasarala-diameter-error-invalid-identity-= 00

 

Hi Yuval

 

Thank you for the comments.

 

I agree that a standard diameter error exists ̵= 1; the AVP error.   The reason I proposed invalid mobile identity= is – it will be more specific to mobile identity.  It can be changed to a 5xxx – but I want an option for the entity to re-send t= he request with a valid value (assuming it can)

 

Yes User-Equipment-info AVP is optional in Credit C= ontrol Request – but we have seen it is present most of the times and= all the times the value is IMEI or IMEISV ( though other values can exist) – but in case of VoLTE / IMS scenarios, the = value is usually IMEI.

 

Now we have lot of cases where due to invalid IMEI = – the number of bad records being generated is increasing – so = need a way to prevent those.

 

So the proposed solution is for the entities receiv= ing IMEI as part of any AVP – to validate it and if found invalid to = respond with a error.  The entity receiving the error has an option to re-send the request with a valid value if it can.

 

 

Regards

Ranjit

VoLTE T4 Support

317-224-9441

 

 

 

From: Yuval Lifshitz [mailto:ylifshitz@sandvine.com]
Sent: Tuesday, October 31, 2017 12:07 PM
To: AVASARALA, RANJIT KUMAR <ra= 698k@att.com>; dime@ietf.org
Cc: ben@nostrum.com; Yuval Li= fshitz <ylifshitz@sandvine.com= >
Subject: RE: draft-avasarala-diameter-error-invalid-identity-00=

 

Dear Ranjit,

I think there are several issues with= your proposal:

  • A = standard diameter error already exists for the case described. It is DIAMET= ER_INVALID_AVP_VALUE (5004)
  • 3xxx level error codes are = meant for peer level (per hop) while the case you describe is session level= (end 2 end)
  • User-Equipment-Info is an optional AVP (at= least in RFC4006), and its payload is not necessarily IMEI or IMEISV. This= mean that specification forcing the credit control server to validate it would contr= adict the existing specification

 

Best Regards,

 

Yuval

 

From: DiME [mailto:dime-bounces@ietf.org] On Behalf Of AVASARALA, RANJIT KUMAR
Sent: Tuesday, October 31, 2017 6:32 PM
To: dime@ietf.org
Cc: ben@nostrum.com
Subject: [Dime] draft-avasarala-diameter-error-invalid-identity-00

 

Hello all

 

We published a new Internet draft addressing the is= sue of invalid IMEI in SIP / Diameter requests.  

 

Here is the background

 

IMEI is used for uniquely identifying the mobile de= vices.  IMEI is present in SIP REGISTER request (Contact header) and D= iameter CCR Request (user-Equipment-Info AVP).   It is always assumed that the IMEI value is correct and also the entities tha= t receive IMEI usually do not validate the value. 

 

This IMEI goes all the way till CCFs which use it a= s part of records generation that eventually lead to generation of CDRs.&nb= sp; So in scenarios where IMEI is correct, the records are considered good but if the IMEI is invalid or incorrect, then the reco= rds that are generated become “bad” and lead to inconsistency i= n billing.

 

So there is a need to reduce or prevent the generat= ion of bad records and this can be done by validating the received IMEI and= reporting invalid instances of IMEI.

 

So in order to report the cases of invalid iMEI, th= is draft proposes a new diameter protocol error code – DIAMETER_INVAL= ID_MOBILE_IDENTITY

 

We request everyone to review the draft and comment= .

 

 

Regards

Ranjit

 

 

 

 

 

 


This e-mail may contain Sprint proprietary information intended for the sol= e use of the recipient(s). Any use by others is prohibited. If you are not = the intended recipient, please contact the sender and delete all copies of = the message.

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18D/yX8AxDMQGg== --_006_e7098a2619c14c2ca030af019f1c376aplswe13m04adsprintcom_-- From nobody Wed Nov 1 07:34:29 2017 Return-Path: X-Original-To: dime@ietfa.amsl.com Delivered-To: dime@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 42FBF13AB12 for ; Wed, 1 Nov 2017 07:34:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.41 X-Spam-Level: X-Spam-Status: No, score=-3.41 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=1.989, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-2.8, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id DcurXj2rJ1e0 for ; Wed, 1 Nov 2017 07:34:22 -0700 (PDT) Received: from mx0a-00191d01.pphosted.com (mx0b-00191d01.pphosted.com [67.231.157.136]) (using TLSv1.2 with cipher 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(8.16.0.21/8.16.0.21) with SMTP id vA1ESrNl032062; Wed, 1 Nov 2017 10:34:20 -0400 Received: from tlpd255.enaf.dadc.sbc.com (sbcsmtp3.sbc.com [144.160.112.28]) by m0083689.ppops.net-00191d01. with ESMTP id 2dy90wpbad-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 01 Nov 2017 10:34:20 -0400 Received: from enaf.dadc.sbc.com (localhost [127.0.0.1]) by tlpd255.enaf.dadc.sbc.com (8.14.5/8.14.5) with ESMTP id vA1EYINF053720; Wed, 1 Nov 2017 09:34:19 -0500 Received: from dalint01.pst.cso.att.com (dalint01.pst.cso.att.com [135.31.133.159]) by tlpd255.enaf.dadc.sbc.com (8.14.5/8.14.5) with ESMTP id vA1EYETg053711 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 1 Nov 2017 09:34:15 -0500 Received: from MOSTLS1MSGHUBAC.ITServices.sbc.com (MOSTLS1MSGHUBAC.itservices.sbc.com [135.41.4.150]) by dalint01.pst.cso.att.com (RSA Interceptor); Wed, 1 Nov 2017 14:34:06 GMT Received: from MOSTLS1MSGUSRFC.ITServices.sbc.com ([169.254.3.70]) by MOSTLS1MSGHUBAC.ITServices.sbc.com ([135.41.4.150]) with mapi id 14.03.0361.001; Wed, 1 Nov 2017 09:33:43 -0500 From: "AVASARALA, RANJIT KUMAR" To: Yuval Lifshitz , "Bertz, Lyle T [CTO]" , "dime@ietf.org" CC: "Gardella, Maryse (Nokia - FR) (maryse.gardella@nokia.com)" , "DOLLY, MARTIN C" Thread-Topic: draft-avasarala-diameter-error-invalid-identity-00 Thread-Index: AdNSZIrJm2O1lnw9Q5e+yrjpjtgOFgABIxwgAAJK+5AAAKJMwAABIT8wAABUNKAAF7UloAARLrEA Date: Wed, 1 Nov 2017 14:33:43 +0000 Message-ID: References: <62823085c481447e95e17e4e62c6ce8c@plswe13m04.ad.sprint.com> <0cc48ec93fd94822a8ca43e1861f44ca@plswe13m04.ad.sprint.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [135.38.35.228] Content-Type: multipart/alternative; boundary="_000_BD15502709C85D4DAA2DCBF30D38A3B71729BE92MOSTLS1MSGUSRFC_" MIME-Version: 1.0 X-RSA-Inspected: yes X-RSA-Classifications: public X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-11-01_03:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_policy_notspam policy=outbound_policy score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1707230000 definitions=main-1711010201 Archived-At: Subject: Re: [Dime] draft-avasarala-diameter-error-invalid-identity-00 X-BeenThere: dime@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Diameter Maintanence and Extentions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Nov 2017 14:34:26 -0000 --_000_BD15502709C85D4DAA2DCBF30D38A3B71729BE92MOSTLS1MSGUSRFC_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Yuval Thank you for the reference, will look at that possibility. Regards Ranjit VoLTE T4 Support 317-224-9441 From: Yuval Lifshitz [mailto:ylifshitz@sandvine.com] Sent: Wednesday, November 01, 2017 1:34 AM To: Bertz, Lyle T [CTO] ; AVASARALA, RANJIT KUMAR = ; dime@ietf.org Cc: Gardella, Maryse (Nokia - FR) (maryse.gardella@nokia.com) ; Yuval Lifshitz Subject: RE: draft-avasarala-diameter-error-invalid-identity-00 Hi Ranjit, Please look at section 7.1.17 (page 99) of the 3GPP/ETSI Gy specification: = http://www.etsi.org/deliver/etsi_ts/132200_132299/132299/14.05.00_60/ts_132= 299v140500p.pdf In that document (which is based on RFC4006) they are specifically addressi= ng the case where User-Equipment-Info is of type IMEI/SV, as well as noting= on the validation of that AVP. Please note that in the specification above, section 7.1.11 (pages 96-97), = domain specific, result codes were added. Would probably be good to propose= the new result code as an enhancement for that spec? This could be a 5xxx or 4xxx result code, depending whether you think that = a retry would resolve the issue. If you think that that would be the way fo= rward with that issue, I would recommend addressing the 3GPP SA5 work group= . Best Regards, Yuval From: Bertz, Lyle T [CTO] [mailto:Lyle.T.Bertz@sprint.com] Sent: Tuesday, October 31, 2017 9:01 PM To: AVASARALA, RANJIT KUMAR; Yuval Lifshitz; dime@ietf.org Subject: RE: draft-avasarala-diameter-error-invalid-identity-00 ty From: AVASARALA, RANJIT KUMAR [mailto:ra698k@att.com] Sent: Tuesday, October 31, 2017 1:57 PM To: Bertz, Lyle T [CTO] >; Yuval Lifshitz >; dime@ietf.org Subject: RE: draft-avasarala-diameter-error-invalid-identity-00 Hi Lyle Answers inline Regards Ranjit VoLTE T4 Support 317-224-9441 From: Bertz, Lyle T [CTO] [mailto:Lyle.T.Bertz@sprint.com] Sent: Tuesday, October 31, 2017 1:46 PM To: AVASARALA, RANJIT KUMAR >; Yuval = Lifshitz >; dime@ietf= .org Subject: RE: draft-avasarala-diameter-error-invalid-identity-00 A few questions: 1. How did a CTF get and invalid IMEI? It is typically pulling from som= ewhere else. invalid iMEI can come from devices reporting invalid IMEI value. = This IMEI value comes from device to MME to PGW and all the way to IMS cor= e. 1. When you say invalid in the spec you reference format. If it is form= at that is doable but if it is questioning data / associations outside of t= he AVP or message then this is problematic. An invalid value in the propo= sal is too vague. Was it a well formed AVP which did not pass some app leve= l semantic check or was it just bad data? by invalid, I mean the data is invalid E.g. the IMEI should be 15 = digits long and should follow the rules defined in RFC 7254/7255. So the C= CF that receives the IMEI should validate the IMEI (which the CCFs currentl= y do not) and once they do, and if they determine that the IMEI is invalid,= then they should insert the error code into Diameter response (E.g. CCA). 1. Is this a IMSI-IMEI(SV) association issue? not association - but the value itself. Technically IMEI and IMEI= SV are same (except for additional value of SV) Lyle From: DiME [mailto:dime-bounces@ietf.org] On Behalf Of AVASARALA, RANJIT KU= MAR Sent: Tuesday, October 31, 2017 1:08 PM To: Yuval Lifshitz >;= dime@ietf.org Subject: Re: [Dime] draft-avasarala-diameter-error-invalid-identity-00 Hi Yuval Thank you for the comments. I agree that a standard diameter error exists - the AVP error. The reason= I proposed invalid mobile identity is - it will be more specific to mobile= identity. It can be changed to a 5xxx - but I want an option for the enti= ty to re-send the request with a valid value (assuming it can) Yes User-Equipment-info AVP is optional in Credit Control Request - but we = have seen it is present most of the times and all the times the value is IM= EI or IMEISV ( though other values can exist) - but in case of VoLTE / IMS = scenarios, the value is usually IMEI. Now we have lot of cases where due to invalid IMEI - the number of bad reco= rds being generated is increasing - so need a way to prevent those. So the proposed solution is for the entities receiving IMEI as part of any = AVP - to validate it and if found invalid to respond with a error. The ent= ity receiving the error has an option to re-send the request with a valid v= alue if it can. Regards Ranjit VoLTE T4 Support 317-224-9441 From: Yuval Lifshitz [mailto:ylifshitz@sandvine.com] Sent: Tuesday, October 31, 2017 12:07 PM To: AVASARALA, RANJIT KUMAR >; dime@i= etf.org Cc: ben@nostrum.com; Yuval Lifshitz > Subject: RE: draft-avasarala-diameter-error-invalid-identity-00 Dear Ranjit, I think there are several issues with your proposal: * A standard diameter error already exists for the case described. It i= s DIAMETER_INVALID_AVP_VALUE (5004) * 3xxx level error codes are meant for peer level (per hop) while the c= ase you describe is session level (end 2 end) * User-Equipment-Info is an optional AVP (at least in RFC4006), and its= payload is not necessarily IMEI or IMEISV. This mean that specification fo= rcing the credit control server to validate it would contradict the existin= g specification Best Regards, Yuval From: DiME [mailto:dime-bounces@ietf.org] On Behalf Of AVASARALA, RANJIT KU= MAR Sent: Tuesday, October 31, 2017 6:32 PM To: dime@ietf.org Cc: ben@nostrum.com Subject: [Dime] draft-avasarala-diameter-error-invalid-identity-00 Hello all We published a new Internet draft addressing the issue of invalid IMEI in S= IP / Diameter requests. Here is the background IMEI is used for uniquely identifying the mobile devices. IMEI is present = in SIP REGISTER request (Contact header) and Diameter CCR Request (user-Equ= ipment-Info AVP). It is always assumed that the IMEI value is correct and= also the entities that receive IMEI usually do not validate the value. This IMEI goes all the way till CCFs which use it as part of records genera= tion that eventually lead to generation of CDRs. So in scenarios where IME= I is correct, the records are considered good but if the IMEI is invalid or= incorrect, then the records that are generated become "bad" and lead to in= consistency in billing. So there is a need to reduce or prevent the generation of bad records and t= his can be done by validating the received IMEI and reporting invalid insta= nces of IMEI. So in order to report the cases of invalid iMEI, this draft proposes a new = diameter protocol error code - DIAMETER_INVALID_MOBILE_IDENTITY We request everyone to review the draft and comment. The URL of the draft is - https://tools.ietf.org/html/draft-avasarala-diame= ter-error-invalid-identity-00.html Regards Ranjit ________________________________ This e-mail may contain Sprint proprietary information intended for the sol= e use of the recipient(s). Any use by others is prohibited. If you are not = the intended recipient, please contact the sender and delete all copies of = the message. --_000_BD15502709C85D4DAA2DCBF30D38A3B71729BE92MOSTLS1MSGUSRFC_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Yuval

 

Thank you for the reference,  will look at tha= t possibility.

 

Regards

Ranjit

VoLTE T4 Support

317-224-9441

 

 

 

From: Yuval Lifshitz [mailto:ylifshi= tz@sandvine.com]
Sent: Wednesday, November 01, 2017 1:34 AM
To: Bertz, Lyle T [CTO] <Lyle.T.Bertz@sprint.com>; AVASARALA, = RANJIT KUMAR <ra698k@att.com>; dime@ietf.org
Cc: Gardella, Maryse (Nokia - FR) (maryse.gardella@nokia.com) <ma= ryse.gardella@nokia.com>; Yuval Lifshitz <ylifshitz@sandvine.com><= br> Subject: RE: draft-avasarala-diameter-error-invalid-identity-00=

 

Hi Ranjit,

Please look at section 7.1.17 (page 9= 9) of the 3GPP/ETSI Gy specification: http://www.etsi.org/deliver/etsi_ts/132200_132299/132299/14.05.00_60/ts_132= 299v140500p.pdf

In that document (which is based on R= FC4006) they are specifically addressing the case where User-Equipment-Info= is of type IMEI/SV, as well as noting on the validation of that AVP.

Please note that in the specification= above, section 7.1.11 (pages 96-97), domain specific, result codes were ad= ded. Would probably be good to propose the new result code as an enhancement for that spec?

This could be a 5xxx or 4xxx result c= ode, depending whether you think that a retry would resolve the issue. If y= ou think that that would be the way forward with that issue, I would recommend addressing the 3GPP SA5 work group.

 

Best Regards,

 

Yuval

 

 

From: Bertz, Lyle T [CTO] [mailto:Lyle.T.Bertz@sprint.com]
Sent: Tuesday, October 31, 2017 9:01 PM
To: AVASARALA, RANJIT KUMAR; Yuval Lifshitz; dime@ietf.org
Subject: RE: draft-avasarala-diameter-error-invalid-identity-00=

 

ty

 

From: AVASARALA, RANJIT KUMAR [mailto:ra698k@att.com]
Sent: Tuesday, October 31, 2017 1:57 PM
To: Bertz, Lyle T [CTO] <Lyle.T.Bertz@sprint.com>; Yuval Lifshitz <ylifshitz@sandvine.com>; dime@ietf.org
Subject: RE: draft-avasarala-diameter-error-invalid-identity-00=

 

Hi Lyle

 

Answers inline <Ranjit>

 

Regards

Ranjit

VoLTE T4 Support

317-224-9441

 

 

 

From: Bertz, Lyle T [CTO] [mailto:Lyle.T.Bertz@sprint.com]
Sent: Tuesday, October 31, 2017 1:46 PM
To: AVASARALA, RANJIT KUMAR <ra= 698k@att.com>; Yuval Lifshitz <ylifshitz@sandvine.com>; dime@ietf.org
Subject: RE: draft-avasarala-diameter-error-invalid-identity-00=

 

A few questions:

 

  1. How did a CTF get and invalid IMEI?  It is typically pulling from som= ewhere else. 

<Ranjit>  invalid iMEI can come from dev= ices reporting invalid IMEI value.  This IMEI value comes from device = to MME to PGW and all the way to IMS core.

  1. When you say invalid in the spec you reference format.  If it is form= at that is doable but if it is questioning data / associations outside of t= he AVP or message then this is problematic.   An invalid value in the proposal is too vague. Was it a well formed AVP which= did not pass some app level semantic check or was it just bad data?

<Ranjit> by invalid, I mean the data is inval= id E.g. the IMEI should be 15 digits long and should follow the rules defin= ed in RFC 7254/7255.  So the CCF that receives the IMEI should validate the IMEI (which the CCFs currently do not) and once they d= o, and if they determine that the IMEI is invalid, then they should insert = the error code into Diameter response (E.g. CCA).

  1. Is this a IMSI-IMEI(SV) association issue? 

<Ranjit> not association – but the valu= e itself.  Technically IMEI and IMEISV are same (except for additional= value of SV)

 

Lyle 

 

From: DiME [mailto:dime-bounces@ietf.org] On Behalf Of AVASARALA, RANJIT KUMAR
Sent: Tuesday, October 31, 2017 1:08 PM
To: Yuval Lifshitz <yli= fshitz@sandvine.com>; dime@ietf.org
Subject: Re: [Dime] draft-avasarala-diameter-error-invalid-identity-= 00

 

Hi Yuval

 

Thank you for the comments.

 

I agree that a standard diameter error exists ̵= 1; the AVP error.   The reason I proposed invalid mobile identity= is – it will be more specific to mobile identity.  It can be changed to a 5xxx – but I want an option for the entity to re-send t= he request with a valid value (assuming it can)

 

Yes User-Equipment-info AVP is optional in Credit C= ontrol Request – but we have seen it is present most of the times and= all the times the value is IMEI or IMEISV ( though other values can exist) – but in case of VoLTE / IMS scenarios, the = value is usually IMEI.

 

Now we have lot of cases where due to invalid IMEI = – the number of bad records being generated is increasing – so = need a way to prevent those.

 

So the proposed solution is for the entities receiv= ing IMEI as part of any AVP – to validate it and if found invalid to = respond with a error.  The entity receiving the error has an option to re-send the request with a valid value if it can.

 

 

Regards

Ranjit

VoLTE T4 Support

317-224-9441

 

 

 

From: Yuval Lifshitz [mailto:ylifshitz@sandvine.com]
Sent: Tuesday, October 31, 2017 12:07 PM
To: AVASARALA, RANJIT KUMAR <ra= 698k@att.com>; dime@ietf.org
Cc: ben@nostrum.com; Yuval Li= fshitz <ylifshitz@sandvine.com= >
Subject: RE: draft-avasarala-diameter-error-invalid-identity-00=

 

Dear Ranjit,

I think there are several issues with= your proposal:

  • A standard diameter error already exists for the case described. It is DIA= METER_INVALID_AVP_VALUE (5004)
  • 3xxx level error codes are meant for peer level (per hop) while the case y= ou describe is session level (end 2 end)
  • User-Equipment-Info is an optional AVP (at least in RFC4006), and its payl= oad is not necessarily IMEI or IMEISV. This mean that specification forcing= the credit control server to validate it would contradict the existing specification

 

Best Regards,

 

Yuval

 

From: DiME [mailto:dime-bounces@ietf.org] On Behalf Of AVASARALA, RANJIT KUMAR
Sent: Tuesday, October 31, 2017 6:32 PM
To: dime@ietf.org
Cc: ben@nostrum.com
Subject: [Dime] draft-avasarala-diameter-error-invalid-identity-00

 

Hello all

 

We published a new Internet draft addressing the is= sue of invalid IMEI in SIP / Diameter requests.  

 

Here is the background

 

IMEI is used for uniquely identifying the mobile de= vices.  IMEI is present in SIP REGISTER request (Contact header) and D= iameter CCR Request (user-Equipment-Info AVP).   It is always assumed that the IMEI value is correct and also the entities tha= t receive IMEI usually do not validate the value. 

 

This IMEI goes all the way till CCFs which use it a= s part of records generation that eventually lead to generation of CDRs.&nb= sp; So in scenarios where IMEI is correct, the records are considered good but if the IMEI is invalid or incorrect, then the reco= rds that are generated become “bad” and lead to inconsistency i= n billing.

 

So there is a need to reduce or prevent the generat= ion of bad records and this can be done by validating the received IMEI and= reporting invalid instances of IMEI.

 

So in order to report the cases of invalid iMEI, th= is draft proposes a new diameter protocol error code – DIAMETER_INVAL= ID_MOBILE_IDENTITY

 

We request everyone to review the draft and comment= .

 

 

Regards

Ranjit

 

 

 

 

 

 


This e-mail may contain Sprint proprietary information intended for the sol= e use of the recipient(s). Any use by others is prohibited. If you are not = the intended recipient, please contact the sender and delete all copies of = the message.

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