Take a look to this scenario!
A UAC sends an INVITE containing SDP like the following:
v=0
o=- 0 0 IN IP4 149.35.48.216
s=SIP Call
c=IN IP4 149.35.48.216
t=0 0
m=audio 5008 RTP/AVP 0 8 4 18
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:4 G723/8000
a=rtpmap:18 G729/8000
The UAS respond with an OK containing the following SDP:
v=0
o=MxSIP 0 0 IN IP4 149.35.48.175
s=SIP Call
c=IN IP4 149.35.48.175
t=0 0
m=audio 5006 RTP/AVP 0 8
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
The UAC start to send RTP packet using PCMU codec.
The UAS start to send RTP packet using PCMA codec.
Who are making a mistake?
I think UAS have to respond supporting only one media (PCMU or PCMA).
In this case it receive a SDP offer. In the answer UAS must select one of the
possible codec.
Let me know your opinion!
Thanks
Lorenzo
___________________________________________
Lorenzo Boffelli
STRE Engineer
Allied Telesis K.K.
Head Office / 4F TOC Bldg, 7-22-17 Nishi-Gotanda,
Shinagawa-ku, Tokyo Japan, 141-8635
European R&D Center
Piazza Tirana, 24/4 b Phone: +39 02 41411201
20147 Milano Fax: +39 02 41411260
ITALY
Email: [EMAIL PROTECTED]
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