Re: [Linphone-users] DTMF on linux 64-bit system

[Simon Morlat]

Hello,

Linphone sends DTMF via RTP RFC2833 extension or SIP info, depending on your 
settings.
Try each one, if none works, that means that the gateway does not support 
those standarts.
The only solution would be that linphone sends dtmf "inband" that is modulate 
them in the stream, which normally should be avoided because voip codecs 
often severely degrade the quality of DTMFs (that's the reason of the 
existence of RFC2833 mode). This is a non trivial change in linphone, that's 
why I would prefer that you send an enhancement request to viatalk's SIP 
service. 
First, send me a log so that I can confirm that the viatalk gateway really 
does not support RFC2833 (telephone-event).

Simon

Le Thursday 04 October 2007 15:47:23 Michael R. Hines, vous avez écrit :
> Hello,
>
> linphone is an awesome program. (Thanks guys) I use it quite frequently
> with viatalk's SIP service. I am having a small problem with the ability to
> use DTMF:
>
> An example sequence of events:
>
> 1. I make a phone call (for example a guided 800-number)
> 2. I get a sequence of menu options from the callee
> 3. I choose one of the options, by clicking the number with my mouse
> 4. The DTMF signal is *not received* by the callee
> 5. I *do* however hear the DTMF tone in my speakers/headset
>
> I've tried this on both 64-bit *and* 32-bit binaries on
> a stock fedora 64-bit linux system.
>
> I'd be happy to provide logs.
>
> Does anyone know why the DTMF is not being recognized on the other side?
>
> Thanks!