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Re: [Linphone-developers] Linphone iOS has no audio codec rtpmap for 711
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From: |
Guillaume Bienkowski |
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Subject: |
Re: [Linphone-developers] Linphone iOS has no audio codec rtpmap for 711u/a and 722 |
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Date: |
Tue, 14 Apr 2015 08:57:34 +0200 |
Hello,
rtpmap for static payloads 0,8 and 9 are standardized, so they are not needed.
See RFC 2327 and RFC 1890
Guillaume Bienkowski
address@hidden
> Le 13 avr. 2015 à 19:53, George Lee <address@hidden> a écrit :
>
> 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
>
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