asterisk users - Jan 2005 - Sending DTMF to PSTN problem with SIP

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.

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@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.
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CClarke 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.
You can only use inband DTMF when using the ulaw or alaw codec.  If you 
use any other codec you need to use Out of Band DTMF, i.e. INFO or 
RFC2833.  This is not an Asterisk issue.  Codecs discort DTMF.  Both 
Asterisk and the phone should be set to the same DTMF mode.

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@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.