[Asterisk-Users] Issue with DTMF Tones - Codec Issues

[maka]

just a suggestion, but why don't you try using RFC2833 dtmf relay
between the cisco and the asterisk box.

use dtmfmode=rfc2833 in sip.conf, and you can also set the dtmf mode
per peer in sip.conf
also, if you use inband dtmf, this would only work with u-law and
a-law, and not g729.

on the cisco, enter 
Router(config-dial-peer)# dtmf-relay rtp-nte
in dial-peer configuration mode.

I recently had problems with a cisco gw forwarding pstn dtmf digits to
my asterisk box, and rfc2833(which is what rtp-nte stands for in
cisco's terms) solved it successfully.


cheers

On 8/16/05, Aaron W <walsham at gmail.com> wrote:
> Topology:
> PSTN<-T1 PRI->NEAX2400<-T1 PRI->Cisco 3825<-Ethernet-> Asterisk VoIP server
> 
> When I make a call to a VoIP user from the PSTN, the call gets routed
> through the PBX, and Cisco.  Because of that the DTMF tones are passed
> inband, which I can hear on the VoIP end of the call. However, I have
> one extension on asterisk set up so that I can check voice mail when
> away from my phone.  When I call that number again via the PSTN, and I
> am prompted to enter my extension number Asterisk never "hears" the
> dtmf tones.  I have done some digging around, and my guess is that the
> issue relates to the codec being used messing up the tones.
> 
> Am I on the right track? Is there a ideal way to handle this?  what do
> others do?
> 
> I have posted my sip.conf below.
> 
> Thanks,
> Aaron
> 
> [general]
> port = 5060                 ; Port to bind to
> bindaddr = 0.0.0.0          ; Address to bind to
> context = default           ; Default for incoming calls (default
> context has no routing for security purposes)
> ;dtmfmode=rfc2833
> dtmfmode=inband
> srvlookup = yes
> disallow=all                ; Disallow all codecs
> ;allow=g729                  ; Codecs that we allow (in order of preference)
> allow=ulaw
> ;allow=alaw
> allow=g729
> ;allow=ulaw
> ;allow=all
> 
> 
> [3120]
> callerid=Aaron Walsh <3120>
> type=friend
> host=dynamic
> canreinvite=no
> qualify=yes
> nat=yes
> setvar=LDPREFIX=1999999
> context=XXXXXXX
> secret=XXXXX
> mailbox=3120 at XXXXX
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