libc@20 is a totally valid rate for libc.  If they are rejecting that, you should file a bug with them.  Depending on how you are negotiating codecs you could force it by our normal codec negotiation settings.

> On Oct 3, 2016, at 5:40 AM, Caragea Silviu <silviu.cpp@gmail.com> wrote:
>
> Hello,
>
> I have a call coming from FS and going via sip to a webrtc compliant client.
> Works fine as time the codec is not ILBC. If codec is ILBC is failing because
> Webrtc consider the codec as being invalid because of the ptime line.
>
> Inside their code:
>
> bool IsILBCRateValid(int rate, int frame_size_samples) {
>   if (((frame_size_samples == 240) || (frame_size_samples == 480)) &&
>       (rate == 13300)) {
>     return true;
>   } else if (((frame_size_samples == 160) || (frame_size_samples == 320)) &&
>       (rate == 15200)) {
>     return true;
>   } else {
>     return false;
>   }
> }
>
> This is failing because rate will be 13300 and frame_size_samples will be 160.
>
> frame_size_samples = (8000 / 1000) * 20 which is 160.
>
> How I can make fs to advertise correctly that the codec ILBC is 30 ms one and not 20 ?
>
> Here is the sdp that's generated:
>
> v=0
> o=FreeSWITCH 1475470534 1475470535 IN IP4 91.231.138.218
> s=FreeSWITCH
> c=IN IP4 91.XXX.XXX.XXX
> t=0 0
> a=msid-semantic: WMS 5K3pT3kGUXTisXNhdMYGtMP1VGBmzT0v
> a=end-of-candidates
> m=audio 16430 RTP/SAVPF 102 0 103 101 104
> a=rtpmap:102 iLBC/8000
> a=fmtp:102 mode=30
> a=rtpmap:0 PCMU/8000
> a=rtpmap:103 isac/16000
> a=fmtp:103 ibitrate=32000;maxbitrate=53400
> a=rtpmap:101 telephone-event/8000
> a=rtpmap:104 telephone-event/16000
> a=fingerprint:sha-256 B9:24:01:90:AD:E6:43:60:10:F9:CA:3A:85:86:26:91:A6:41:A8:77:3B:F0:39:20:3C:50:0F:A3:5E:1F:48:03
> a=setup:actpass
> a=rtcp-mux
> a=rtcp:16430 IN IP4 91.xxx.xxxx.xxx
> a=ssrc:4159978388 cname:tTLcMVJxIsF1gi8j
> a=ssrc:4159978388 msid:5K3pT3kGUXTisXNhdMYGtMP1VGBmzT0v a0
> a=ssrc:4159978388 mslabel:5K3pT3kGUXTisXNhdMYGtMP1VGBmzT0v
> a=ssrc:4159978388 label:5K3pT3kGUXTisXNhdMYGtMP1VGBmzT0va0
> a=ice-ufrag:VWQeyw6k2xxshnNB
> a=ice-pwd:6oDJad6JwBACKzMvlsAKOwUH
> a=candidate:8788212768 1 udp 659136 91.XXX.XXX.XXX16430 typ host generation 0
> a=candidate:8788212768 2 udp 659136 91.XXX.XXX.XXX16430 typ host generation 0
> a=silenceSupp:off - - - -
> a=ptime:20
>
> Silviu

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