2007/7/6, Jerry Richards <[EMAIL PROTECTED]>:
> In response to a re-INVITE from the server, I am seeing sofia-sip (v 1.12.4)
> sending out a 200 OK SDP body that appears to be missing a field. Here are
> the details:
> 1) NUA sends outgoing INVITE (via nua_invite() with SOATAG_USER_SDP)
> containing the following (as seen in Ethereal):
> ... (m): audio ...
> ... (a): rtpmap:0 G711/8000
> 2) Server replies (via 200 OK) with SDP fields (as seen in Ethereal):
> ... (m): audio ...
> ... (a): rtpmap:0 PCMU/8000
> ... (a): rtpmap:96 telephone-event/8000
> ... (a): fmtp:96 0-16
> ... (a): silenceSupp:off - - - -
>
> 3) Server sends re-INVITE with SDP fields (as seen in Ethereal):
> ... (m): audio ...
> ... (a): rtpmap:0 PCMU/8000
> ... (a): rtpmap:96 telephone-event/8000
> ... (a): fmtp:96 0-16
> ... (a): silenceSupp:off - - - -
>
> 4) NUA replies (via nua_respond(200 "OK") and identical SOATAG_USER_SDP
> as original INVITE), but this is what I see in outgoing 200 OK SDP
> body in Ethereal:
> ... (m): audio ...
> ... (a): rtpmap:96 telephone-event/8000/1
>
> The outgoing 200 OK should also contain either
>
> ... (a): rtpmap:0 PCMU/8000
> or
> ... (a): rtpmap:0 G711/8000
>
> I have a Polycomm phone that I am comparing this with. Do you know why this
> field is missing?
I guess the "G711" codec name is your problem. If they payload type
name is there, the soa and sdp uses the name and not the payload type
number when it matches the codecs. So "G711" does not match with
"PCMU".
Polycomm either digs "G711" in offer but uses "PCMU" in answer, or
rejects all your codecs but includes PCMU in answer in distant hope
that your UA could send PCMU to it.
SOA doesn't include G711, probably because there is the
telephony-event codec which it selects as common codec. I guess if you
included a tag SOATAG_AUDIO_AUX("telephone-event") in
nua_set_params()/nua_invite() tags, SOA would include both "G729" and
"G711" in the answer.
--
Pekka.Pessi mail at nokia.com
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