[asterisk-users] DTMF between cisco and sipura going throughasterisk

[Benjamin Lawetz]

We're actually using a mix of 1.2.11 and 1.0.7 (in the process of
upgrading). The problem occurs on both versions. But I seem to have found a
solution by setting the dtmf mode to "info" (it's always the simple things
;-))

Thanks for the help

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Greg Boehnlein
Sent: August 31, 2006 12:51 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] DTMF between cisco and sipura going
throughasterisk

On Tue, 29 Aug 2006, Benjamin Lawetz wrote:

> Hello all,
> 
> 	we're having an issue with DTMFs being sent to Sipura's. Calls are 
> originating from a Cisco AS5300 being sent to asterisk which in turn 
> sends it to the Sipura. Connected to the Sipura is a legacy PBX (or 
> actually shows the same problem with a cheap answering machine). The 
> DTMFs sent from the AS5300 aren't recognised by the legacy PBX.
> 
> - DTMFs are recognised correctly on the asterisk (when we check 
> voicemail)
> - The cisco is setup with dtmf-relay rtp-nte
> - in sip.conf the cisco and sipura are set to rfc2833
> 
> If I set the cisco in dtmf-relay rtp-cisco it works on the sipura, but 
> not on the asterisk.
> 
> Unfortunately I can only set one dtmf-relay mode on the cisco. Is 
> there anything I can change on asterisk or sipura to get the sipura to 
> work with the rtp-nte (or to get asterisk to work with the cisco-rtp)?
> 
> Any hints can help,

Ben,
	What version of Aserisk are you using? If it is the 1.2 series,
there are all sorts of RFC-2833 DTMF Relay issues that can crop up. My
suggestion is that if you are willing to take the time, it might be worth it
to Upgrade to the pre-release version of Asterisk that is currently in
TRUNK. This supports the new Variable Length DTMF code that should knock out
nearly all of the DTMF issues that Asterisk has had. The 1.2 and earlier RTP
stack and RFC-2833 implementation, while not technically wrong according to
the RFC, did things a bit differently than the rest of the world has chosen,
and therefore can cause DTMF instability.

-- 
    Vice President of N2Net, a New Age Consulting Service, Inc. Company
         http://www.n2net.net Where everything clicks into place!
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