Re: [Linphone-users] lastest update breaks dtmf on ios and android

[Russell Treleaven]

Hi Gautier,

Thanks for getting back to me.

I will test against  the master branch of freeswitch and if it is still an issue I will post a bug.

Sincerely,

Russell Treleaven

On Tue, May 26, 2015 at 5:59 AM, Gautier Pelloux-Prayer <address@hidden> wrote:

Hi Russell,

Sorry for the late answer we were quite busy these last days.

The issue is indeed caused by some changes in our code which was necessary to be RFC compliant:

1) According to RFC4733, telephony-event clock-rate should be the same as audio codec in use (https://tools.ietf.org/html/rfc4733#section-2.1). Since you are using Opus 48kHz, Linphone offers telephone-event/48000 (among with others).
2) Freeswitch is declining it (this payload type is not included in the answer from Freeswitch). Linphone is then not allowed to send telephone-event/48000 according to offer answer model (RFC3264, Section 7). Since sending telephone-event/8000 over a 48000 Hz audio stream is also prohibited, no telephone-event are sent at all.

I think you should consider reporting this issue to Freeswitch project.

Cheers,

Gautier Pelloux-Prayer
Software Engineer @ Belledonne Communications

> On 12 May 2015, at 19:10, Russell Treleaven <address@hidden> wrote:
>
> I did a bit more testing and have more findings to share.
>
> Until the latest update to the linphone mobile clients rfc-2833 and opus working as expected with freeswitch
>
> ios Linphone iPhone 2.2.4.2-store-85-gbfcbadb
> android Linphone 2.4.0
>
> The simplest change to make rfc-2833 dtmf work again is to disable opus on linphone
>
> Linphone is the uac and freeswitch is the uas in the described scenario
>
> the relevant bits of the bad sdp exchange looks like this
>
> invite
>    m=audio 7076 RTP/AVP 96 0 8 9 101 97
>    a=rtpmap:96 opus/48000/2
>    a=fmtp:96 useinbandfec=1; stereo=0; sprop-stereo=0
>    a=rtpmap:101 telephone-event/48000
>    a=rtpmap:97 telephone-event/8000
>
> ok
>    m=audio 16016 RTP/AVP 96 101
>    a=rtpmap:96 opus/48000/2
>    a=fmtp:96 useinbandfec=1
>    a=rtpmap:101 telephone-event/8000
>    a=fmtp:101 0-16
>
> the relevant bits of good sdp exchange looks like this
>
> invite
>    m=audio 7076 RTP/AVP 0 8 101
>    a=rtpmap:101 telephone-event/8000
>
> ok
>    m=audio 16008 RTP/AVP 0 101
>    a=rtpmap:0 PCMU/8000
>    a=rtpmap:101 telephone-event/8000
>    a=fmtp:101 0-16
>
> Can you confirm that the last update to linphone changed your spd offer in regard to opus and dtmf?
>
> Sincerely,
>
> Russell Treleaven
>
>
> On Tue, May 12, 2015 at 1:32 AM, Russell Treleaven <address@hidden> wrote:
> Actually info is working, using it as a partial workaround for now.
>
>
> On Mon, May 11, 2015 at 2:26 PM, Russell Treleaven <address@hidden> wrote:
> Hi,
>
> I am calling an ivr on
> FreeSWITCH Version 1.5.15b+git~20141215T224714Z~0b414a8de8~64bit (git 0b414a8 2014-12-15 22:47:14Z 64bit)
>
> Linphone was working as expected until I updated the apps to the latest release.
> Acrobits, Bria and Zoiper all work as expected.
> I have included a couple of sample invites and a small dialplan exerpt that demonstrates the problem.
>
> The rtpmap for linphone has the sample rate set to 48000 which may be an issue.
>
>
>
>
>
> On Mon, May 11, 2015 at 5:33 AM, Gautier Pelloux-Prayer <address@hidden> wrote:
> Hi,
>
> Testing it between:
> - Linphone Android 2.4.0 and Linphone desktop (both SIP INFO + RFC2833): working fine.
> - Linphone Android 2.4.0 and tier SIP provider (RFC2833): working fine.
> - Linphone iphone 2.2.5-125 and Linphone desktop (both SIP INFO + RFC2833): working fine.
>
> What's your setup?
>
> Regards,
>
> Gautier Pelloux-Prayer
> Software Engineer @ Belledonne Communications
>
> > On 08 May 2015, at 03:55, Russell Treleaven <address@hidden> wrote:
> >
> > Can someone please verify that the latest update to Android and IOS linphone applications breaks DTMF. Neither info or rfc-2833 seem to work.
> >
> > versions tested
> > ios Linphone iPhone 2.2.4.2-store-85-gbfcbadb
> > android Linphone 2.4.0
> >
> > Sincerely
> >
> > Russell Treleaven
> > _______________________________________________
> > Linphone-users mailing list
> > address@hidden
> > https://lists.nongnu.org/mailman/listinfo/linphone-users
>
>
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