Re: Megaco Digest, Vol 54, Issue 2
Rajiv Ginotra <[email protected]>
| Newsgroups | gmane.ietf.megaco |
|---|---|
| Message-ID | <000301c92c40$90259140$c1da1eac@rginotrawxp02> |
Hi All, Just to add what Priyanka said, Even when u send the modify with local descriptor containing codec other than in remote descriptor then you send the "Codec Negotiation Failure" as the intersection between the New local and the existing remote is empty. Regards Rajiv -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Friday, October 10, 2008 11:52 AM To: [email protected] Subject: Megaco Digest, Vol 54, Issue 2 Send Megaco mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit https://www.ietf.org/mailman/listinfo/megaco or, via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of Megaco digest..." Today's Topics: 1. Codec Negotiation Question (Ramesh Babu Kuppili) 2. Re: Codec Negotiation Question (Deepak Bissa) 3. Re: Codec Negotiation Question (Priyanka Yadav) ---------------------------------------------------------------------- Message: 1 Date: Fri, 10 Oct 2008 10:27:09 +0530 From: Ramesh Babu Kuppili <[email protected]> Subject: [Megaco] Codec Negotiation Question To: [email protected] Cc: Murugesh Govindaraju <[email protected]> Message-ID: <[email protected]> Content-Type: text/plain; charset="us-ascii" Gurus, I have a question about Codec Negotiation in Megaco. Lets says the switch initially sends us local and remote codec list. We take a intersection of the both local and remote and respond to the request. Then at a later stage lets says the switch sends another modify with only local codec list. And this time the local codec does not intersect with the remote codec list that was received previously. My question is, "How should the gateway behave to the the codec list in the modify?". 1. Should it assume the the remote will also support all the codecs in the list of Modify and respond to the modify with all supported codecs. 2. Should it send a "codec negotiation failure" as response for Modify since the codec list in the modify does not intersect with the remote codec list previously sent. - ramesh ~~~~~~~~~~~~~~~~~~Example messages~~~~~~~~~~~~~~~~~~~ Request with both local and remote: MEGACO/1 [172.16.43.151] Transaction = 58738{Context = 3{Modify = Eag26/ep2{Media{Stream = 1{LocalControl{Mode = SendReceive , ReservedValue = off , ReservedGroup = off , tdmc/ec = on} , Local{v=0 c=IN IP4 $ m=audio $ RTP/AVP 18 a=ptime:40 v=0 c=IN IP4 $ m=audio $ RTP/AVP 101 a=rtpmap:101 telephone-event/8000 a=ptime:40 } , Remote{v=0 c=IN IP4 172.16.43.155 m=audio 6024 RTP/AVP 18 a=ptime:40 v=0 c=IN IP4 172.16.43.155 m=audio 6024 RTP/AVP 101 a=rtpmap:101 telephone-event/8000 a=ptime:40 }}}}}} Request with local only: MEGACO/1 [172.16.43.151] Transaction = 58741{Context = 3{Modify = AG26{Media{Stream = 1{LocalControl{Mode = SendReceive , tdmc/ec = off}} , TerminationState{Buffer = off , fax/faxstate = Negotiating}} , Events = 16777230{fax/faxconnchange , al/on , al/fl}} , Modif c=IN IP4 $ m=audio $ RTP/AVP 8 a=ptime:20 }} , TerminationState{Buffer = off , ipfax/faxstate = Negotiating , ctyp/calltyp = FAX}}}}} -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://www.ietf.org/mailman/private/megaco/attachments/20081010/809e0e3b/a ttachment-0001.htm> ------------------------------ Message: 2 Date: Fri, 10 Oct 2008 11:06:57 +0530 From: Deepak Bissa <[email protected]> Subject: Re: [Megaco] Codec Negotiation Question To: Ramesh Babu Kuppili <[email protected]>, "[email protected]" <[email protected]> Cc: Murugesh Govindaraju <[email protected]> Message-ID: <31F873353B13F2419C80FD0833E118951E86C1DD1F@GUREXMB01.ASIAN.AD.ARICENT.COM> Content-Type: text/plain; charset="us-ascii" As per section 7.1.1 of H.248.1 (v3) "If a required descriptor other than the Audit Descriptor is unspecified (i.e. entirely absent) from a command, the previous values set in that descriptor for that termination, if any, are retained." Thus, in case when only local codec is sent by MGC and remote is absent then previous remote descriptor will be retained. In such scenario, if the local codec does not intersect with remote codec and MG does not asymmetric codec then it should reply with an error "515 Unsupported Media Type". If asymmetric codec is supported by MG then codec negotiation will be successful. With regards, Deepak Bissa ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Ramesh Babu Kuppili Sent: Friday, October 10, 2008 10:27 AM To: [email protected] Cc: Murugesh Govindaraju Subject: [Megaco] Codec Negotiation Question Gurus, I have a question about Codec Negotiation in Megaco. Lets says the switch initially sends us local and remote codec list. We take a intersection of the both local and remote and respond to the request. Then at a later stage lets says the switch sends another modify with only local codec list. And this time the local codec does not intersect with the remote codec list that was received previously. My question is, "How should the gateway behave to the the codec list in the modify?". 1. Should it assume the the remote will also support all the codecs in the list of Modify and respond to the modify with all supported codecs. 2. Should it send a "codec negotiation failure" as response for Modify since the codec list in the modify does not intersect with the remote codec list previously sent. - ramesh ~~~~~~~~~~~~~~~~~~Example messages~~~~~~~~~~~~~~~~~~~ Request with both local and remote: MEGACO/1 [172.16.43.151] Transaction = 58738{Context = 3{Modify = Eag26/ep2{Media{Stream = 1{LocalControl{Mode = SendReceive , ReservedValue = off , ReservedGroup = off , tdmc/ec = on} , Local{v=0 c=IN IP4 $ m=audio $ RTP/AVP 18 a=ptime:40 v=0 c=IN IP4 $ m=audio $ RTP/AVP 101 a=rtpmap:101 telephone-event/8000 a=ptime:40 } , Remote{v=0 c=IN IP4 172.16.43.155 m=audio 6024 RTP/AVP 18 a=ptime:40 v=0 c=IN IP4 172.16.43.155 m=audio 6024 RTP/AVP 101 a=rtpmap:101 telephone-event/8000 a=ptime:40 }}}}}} Request with local only: MEGACO/1 [172.16.43.151] Transaction = 58741{Context = 3{Modify = AG26{Media{Stream = 1{LocalControl{Mode = SendReceive , tdmc/ec = off}} , TerminationState{Buffer = off , fax/faxstate = Negotiating}} , Events = 16777230{fax/faxconnchange , al/on , al/fl}} , Modif c=IN IP4 $ m=audio $ RTP/AVP 8 a=ptime:20 }} , TerminationState{Buffer = off , ipfax/faxstate = Negotiating , ctyp/calltyp = FAX}}}}} ________________________________ "DISCLAIMER: This message is proprietary to Aricent and is intended solely for the use of the individual to whom it is addressed. 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URL: <https://www.ietf.org/mailman/private/megaco/attachments/20081010/8d424049/a ttachment-0001.htm> ------------------------------ Message: 3 Date: Fri, 10 Oct 2008 11:52:56 +0530 From: "Priyanka Yadav" <[email protected]> Subject: Re: [Megaco] Codec Negotiation Question To: "'Ramesh Babu Kuppili'" <[email protected]>, <[email protected]> Cc: 'Murugesh Govindaraju' <[email protected]> Message-ID: <005901c92aa0$a48603f0$83a44e0a@priyadavwxp01> Content-Type: text/plain; charset="us-ascii" Hi Ramesh I think you should send a "codec negotiation faliure" as response of Modify since the codec list in modify doesnot intersect with the remote codec list previously sent. If you go by approach one and in your example case One gateway will move from codec 18 to 8. But the other gateway will not have any information about this codec change. So, I think second approach is better. Thanks Priyanka _____ From: [email protected] [mailto:[email protected]] On Behalf Of Ramesh Babu Kuppili Sent: Friday, October 10, 2008 10:27 AM To: [email protected] Cc: Murugesh Govindaraju Subject: [Megaco] Codec Negotiation Question Gurus, I have a question about Codec Negotiation in Megaco. Lets says the switch initially sends us local and remote codec list. We take a intersection of the both local and remote and respond to the request. Then at a later stage lets says the switch sends another modify with only local codec list. And this time the local codec does not intersect with the remote codec list that was received previously. My question is, "How should the gateway behave to the the codec list in the modify?". 1. Should it assume the the remote will also support all the codecs in the list of Modify and respond to the modify with all supported codecs. 2. Should it send a "codec negotiation failure" as response for Modify since the codec list in the modify does not intersect with the remote codec list previously sent. - ramesh ~~~~~~~~~~~~~~~~~~Example messages~~~~~~~~~~~~~~~~~~~ Request with both local and remote: MEGACO/1 [172.16.43.151] Transaction = 58738{Context = 3{Modify = Eag26/ep2{Media{Stream = 1{LocalControl{Mode = SendReceive , ReservedValue = off , ReservedGroup = off , tdmc/ec = on} , Local{v=0 c=IN IP4 $ m=audio $ RTP/AVP 18 a=ptime:40 v=0 c=IN IP4 $ m=audio $ RTP/AVP 101 a=rtpmap:101 telephone-event/8000 a=ptime:40 } , Remote{v=0 c=IN IP4 172.16.43.155 m=audio 6024 RTP/AVP 18 a=ptime:40 v=0 c=IN IP4 172.16.43.155 m=audio 6024 RTP/AVP 101 a=rtpmap:101 telephone-event/8000 a=ptime:40 }}}}}} Request with local only: MEGACO/1 [172.16.43.151] Transaction = 58741{Context = 3{Modify = AG26{Media{Stream = 1{LocalControl{Mode = SendReceive , tdmc/ec = off}} , TerminationState{Buffer = off , fax/faxstate = Negotiating}} , Events = 16777230{fax/faxconnchange , al/on , al/fl}} , Modif c=IN IP4 $ m=audio $ RTP/AVP 8 a=ptime:20 }} , TerminationState{Buffer = off , ipfax/faxstate = Negotiating , ctyp/calltyp = FAX}}}}} -------------- next part -------------- An HTML attachment was scrubbed... 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