[asterisk-users] DTMF between Asterisk servers.

[Steve Davies]

I believe that what you described should "just work" with the caveat
that "dtmf=inband" is rarely the right thing to do over SIP, and is
prone to all sorts of DTMF detection and debounce issues.

I assume you've tried calling a POTS endpoint and listening to see if
you get DTMF passed through?

1) You did not give a great deal of information about what the current
situation was, or what investigations you've already tried, which is
probably why no-one felt they could reply.
2) It may also have been because less than 23 hours had elapsed...

Regards,
Steve

On 08/04/2008, Mark Hamilton <mark.h at cage151.com> wrote:
>
> I find it  hard to believe no one knows, so is it just plain no helping? J
>
> If someone would like to atleast point me in the right direction that will
> deal specifically with what I'm asking, that would be appreciated too.
>
> Much thanks.
>
> From: Mark Hamilton [mailto:mark.h at cage151.com]
>  Sent: April 7, 2008 11:48 AM
>  To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
>  Subject: DTMF between Asterisk servers.
>
> Hello,
>
> I'm a little confused on DTMF.
>
> A sip peer is registered on two Asterisk servers. No dtmfmode is set for
> them, the sip peer is 999 on Asterisk 1 and 999 on Asterisk 2. They both
> register on each other.
>
>
>
> A call comes in on Asterisk server 1, provider 1, dtmf=inband. Then the call
> is transferred to Asterisk 2:
>
> RetryDial(/var/lib/asterisk/sounds/connecting,15,10,SIP/12351 at 65.xx.xx.10,,tT,)
>
> Where 12351 accepts the call on Asterisk 2, and in some cases, that call is
> transferred out to a PSTN number, or wherever, but not within Asterisk
> anymore via provider2, dtmf=rfc2833.
>
> When the call comes in, I'd like it to relay DTMF just dandy. How can I do
> so?
>
> There is no NAT between the Asterisk servers or in front of them. However,
> Asterisk2 has iptables which allows all UDP traffic  to/fro Asterisk1. When
> Asterisk2 transfers the call to external endpoints, there might be a LAN,
> but relative ports are open on those LANs.
>
> Please help.
>
> Thanks in advance,
>
> Mark.