[Asterisk-Users] Sending DTMF to PSTN problem with SIP

[Christina Clarke]

Thanks for the suggestion!

I have tuned the SIPURA SPA 2000 gain as suggested and also re-adjusted X100P
gain and echo cancel. That helped a lot with audio quality. But still cannot
send DTMF tones out over PSTN. As well I discovered DTMF transmission from IAX
soft phone out to PSTN is not at all reliable either, so it seems to be on the
PSTN (X100P) side somewhere.

I cannot find any settings to tweak DTMF transmission other than relaxdtmf,
and can't find any log messages which indicate anything is going wrong. A
plain analog phone plugged into the PSTN sends DTMF which is recognized ok.

Any ideas appreciated...

> You can configure the gain to be lower on the SPA2000
> via the web interface - Ido not remember the exact
> location, but you will find it under advanced
> settings.
> 
> --- CClarke <mordra at hurontel.on.ca> wrote:
> 
> > Dear All ~
> >
> > I have * setup & running ok (with two Wildcard
> > X100P's to PSTN). I also have
> > two analog phones connected into same through a
> > SIPURA 2000. These work fine,
> > except that when I call out through PSTN & try to
> > send DTMF tones to (say) a
> > remote PBX to dial an extension, the gain seems to
> > go wild (high), and the
> > DTMF tones are not recognized at the other end.
> >
> > I tried setting the SIP2000 to use inband dtmfmode
> > (as opposed to auto), and
> > likewise in sip.conf, but no success.
> >
> > btw, I've also set relaxdtmf=yes in zapata.conf
> > since inbound calls sometimes
> > seem to have trouble dialling extensions.
> >
> > A soft IAX phone (e.g. DIAXPhone) works ok, so I
> > suspect my SIP2000/sip.conf
> > setup, but can't see what I'm doing wrong.
> >
> > Christina.