[Asterisk-Dev] Frame.c/frame.h RTP payload formats

[Olle E. Johansson]

I'm on thin ice here, so I want help to confirm if this is a bug.

Check this output from SIP debug:
---------------
m=audio 10020 RTP/AVP 0 8 3 18 101^M
a=rtpmap:0 pcmu/8000^M
a=rtpmap:8 pcma/8000^M
a=rtpmap:3 gsm/8000^M
a=rtpmap:18 g729/8000^M
a=rtpmap:101 telephone-event/8000^M
a=fmtp:101 0-15^M
a=sendrecv^M
-*-
    - 16 headers, 13 lines
* Using latest SIP request as basis request
* Found audio format UNKN
* Found audio format ALAW
* Found audio format UNKN
* Found audio format UNKN
* Found audio format UNKN
* Found description format pcmu
* Found description format pcma
* Found description format gsm
* Found description format g729
* Found description format telephone-event
--------
Asterisk parses the number list wrong (m=audio) and the rtpmap right. The numbers in frame.h
doesn't map to IANAs list on
http://www.iana.org/assignments/rtp-parameters

It's so different, so I don't know if they're the same. The calling phone (Snom 200) follows
IANAs list. Is there a reason why the codec list in frame.h is so different. I would like
to either correct that list or use another table for SDP parsing. Changing frame.h may
cause other problems elsewhere in Asterisk...

In this case, Asterisk finds GSM codec from Grandstream phone, but the phone doesn't
indicate GSM support - or?
-----
m=audio 5004 RTP/AVP 0 8 4 18 2 15^M
a=rtpmap:0 PCMU/8000^M
a=rtpmap:8 PCMA/8000^M
a=rtpmap:4 G723/8000^M
a=rtpmap:18 G729/8000^M
a=rtpmap:2 G726-32/8000^M
a=rtpmap:15 G728/8000^M
a=ptime:20^M
-*-
   - 13 headers, 13 lines
* Using latest SIP request as basis request
* Found audio format UNKN
* Found audio format ALAW
* Found audio format ULAW
* Found audio format UNKN
* Found audio format GSM
* Found audio format UNKN
* Found description format PCMU
* Found description format PCMA
* Found description format G723
* Found description format G729
* Found description format G726-32
* Found description format G728

--------
(Side comment: RTP Payload 2 is "reserved" on IANAs site, but GS uses that for G726-32)

Comments, please?

/O