Codec Negotiation Question
Ramesh Babu Kuppili <[email protected]>
| Newsgroups | gmane.ietf.megaco |
|---|---|
| Message-ID | <[email protected]> |
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}}}}}
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