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

From: George Lee
Subject: [Linphone-developers] Linphone iOS has no audio codec rtpmap for 711u/a and 722
Date: Mon, 13 Apr 2015 13:53:15 -0400


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,

o=7274837761 238 1151 IN IP4
c=IN IP4
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
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?


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