[Linphone-developers] Linphone iOS has no audio codec rtpmap for 711u/a and 722

[George Lee]

Hi,

I built the lastest iOS for Linphone and ran the iPhone 6 simulator on
the Mac. I disabled all audio codecs except g711a, g711u and g722,
then ran a SIP call to a test server. Call failed and a popup screen
said "Incompatible, check codecs..". Then I looked at the SDP in the
SIP INVITE sent by Linphone,

v=0
o=7274837761 238 1151 IN IP4 108.9.160.151
s=Talk
c=IN IP4 108.9.160.151
b=AS:512
t=0 0
a=rtcp-xr:rcvr-rtt=all:10000 stat-summary=loss,dup,jitt,TTL voip-metrics
m=audio 7076 RTP/AVPF 0 8 9 101
a=rtpmap:101 telephone-event/8000
a=rtcp:7077 IN IP4 192.168.1.160
a=rtcp-fb:* trr-int 5000

Why are a=rtpmap entries missing for "0 8 9" in the SDP?

A side question, how to enable H263 codec for iOS?

Thanks,
George