[Freeswitch-users] codec and vad and cng configuration

[Mark D. Anderson]

It seems FS will simply go through the rtpmap offers in an incoming INVITE,
in the incoming order, and pick the first one that is in the codec-prefs
in my sofia.conf.xml (see end of this message for trace).

But I was expecting that FS (or sofia underneath) would instead negotiate
by checking codecs in my configured list, and pick the first matching one
in *my* list, not the first matching one in *their* list.

I see there is a "inbound-late-negotiation" param, but I don't
know how this would be used -- nor do I think i'd want to use
it, if the priority can just be taken from my list.

Regarding VAD, I'm wondering why there is an "in" or "both" setting --
isn't VAD chosen by the sender?
Also, it seems kind of limiting to have to enable VAD regardless
of who is connecting (what UA) and regardless of what codec is in
use. 
And I see no way to control CNG at all?

-mda

example trace, showing how it picks PCMU since it is first in their list,
when the first match in my list would have been iLBC

----

2007-06-09 13:03:43 [DEBUG] sofia.c:1028 sofia_handle_sip_i_state() Remote SDP:
v=0
o=root 12720 12720 IN IP4 67.55.159.156
s=session
c=IN IP4 67.55.159.156
t=0 0
m=audio 12104 RTP/AVP 0 8 3 111 5 10 7 97 18 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:3 GSM/8000
a=rtpmap:111 G726-32/8000
a=rtpmap:5 DVI4/8000
a=rtpmap:10 L16/8000
a=rtpmap:7 LPC/8000
a=rtpmap:97 iLBC/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -

2007-06-09 13:03:43 [DEBUG] sofia_glue.c:1157 sofia_glue_negotiate_sdp() Audio Codec Compare [PCMU:0:8000]/[speex:98:8000]
2007-06-09 13:03:43 [DEBUG] sofia_glue.c:1157 sofia_glue_negotiate_sdp() Audio Codec Compare [PCMU:0:8000]/[iLBC:97:8000]
2007-06-09 13:03:43 [DEBUG] sofia_glue.c:1157 sofia_glue_negotiate_sdp() Audio Codec Compare [PCMU:0:8000]/[GSM:3:8000]
2007-06-09 13:03:43 [DEBUG] sofia_glue.c:1157 sofia_glue_negotiate_sdp() Audio Codec Compare [PCMU:0:8000]/[PCMA:8:8000]
2007-06-09 13:03:43 [DEBUG] sofia_glue.c:1157 sofia_glue_negotiate_sdp() Audio Codec Compare [PCMU:0:8000]/[PCMU:0:8000]
2007-06-09 13:03:43 [DEBUG] sofia_glue.c:817 sofia_glue_tech_set_codec() Set Codec sofia/profile1/8572337508 at 67.55.159.156:5060 PCMU/8000 20 ms