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

[Simon Morlat]

Hi,

From the log it is clear that the gateway does not support RFC2833 (=outband) 
dtmf signaling, since it does not set "telephone-event" codec in the SDP 
message attached to the "200 OK" answer.

Unfortunately linphone does not support in-band dtmfs, and this is not planned 
since this method is clearly not recommended for voice over IP.

I think you should report this problem to the gateway's administrator. This is 
really an important missing feature.

Simon


Le Sunday 14 October 2007 21:09:07 Michael R. Hines, vous avez écrit :
> Here's some more followup information:
>
> 1. Kphone's DTMF does work with viatalk. It's tone is a lot longer
> when pressed (suggesting tone length matters), but I'm not exactly familiar
> with that.
>
> 2. My linksys pap2T device only works when I select "in-band" in the
> settings. This suggests that viatalk does not properly support out-of-band
> signaling. (This also suggests that kphone uses in-band signaling, as I can
> arbitrarily hold down the DTMF tone for as long as I want.)
>
> 3. I've attached a sample (failing DTMF) log file from linphone to a sample
>    1-800 number that requires DTMF interaction.
>
> For now I'm using kphone, but I like linphone's UI better.
>
> I'd be happy to provide anymore information
> that would help track down the problem.
>
> - Michael
>
> Simon Morlat wrote:
> > Le Sunday 07 October 2007 12:27:10 address@hidden, vous avez 
écrit :
> >> Ashok Hirpara:
> >>> It is working for me using RTP RFC2883. I don't know much about it
> >>> using SIP INFO
> >>
> >> Here (using RTP RFC2883 also) sometimes it works, and sometimes it
> >> doesn't.
> >
> > Maybe the DTMF sound from the speakers is echoed back to the server,
> > causing sometimes a correct recognition.
> > I doubt this gateway is really supporting telephone-event. (to be checked
> > with the log)
> >
> > Simon
> >
> >
> >
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