[asterisk-users] DTMF Problem w/ MeetMe

[Phillip Heller]

So the PBX in Europe has a local extension and DID configured for the  
Asterisk MeetMe such that users in Europe have a local number to  
dial....

Placing the call from Boston to the European extension is only to  
duplicate and hopefully solve the problem.

When I came aboard this company, it had already been decided to go the  
Cisco CME route with SCCP based phones.  In fact, it works quite well  
for the standard PBX functionality, voicemail, etc.

I brought Asterisk in to save us money on the Reservationless  
Conference Bridges we were paying for.

The audio sounds great, never had a problem with that at all.

I have tooled around with the various dtmf-relay options, though to no  
positive effect.  I'll keep playing with it tomorrow.  If you happen  
to think of anything else, I certainly appreciate the input.

Regards,

--phil

On Jun 4, 2009, at 9:59 PM, David Backeberg wrote:

> On Thu, Jun 4, 2009 at 9:34 PM, Phillip Heller <pheller at me.com> wrote:
>> Cisco 7941 <-SCCP-> Cisco 2821(CME,Boston) <-SIP-> Cisco
>> 2821(CME,Europe) <-SIP-> Asterisk(Boston)
>> debugging enabled on Asterisk, I see that I often get duplicate DTMF
>> entries.  So where I might have dialed 1234#, Asterisk sees 112344#  
>> or
>> similar, under scenario 2.
>> Any suggestions?
>
> Yes.
>
> Why on earth do you send the call to Europe and back? Can you leave it
> in Boston?
>
> Question. Have you considered flashing the 7941s with the SIP
> firmware? As it stands right now, your voip gateways have to transcode
> the audio to Skinny to/from SIP.
>
> Question. Why not take some steps out of the equation, and terminate
> the SIP straight into asterisk?
>
> Question. What good is the Cisco gear doing in your diagram?
>
> Question. Assuming you ever get through, what does the audio sound
> like? Are your dropping packets and having the voice sound like
> garbage?
>
> Another suggestion: you can debug on the Cisco side too. The Cisco
> gear has a lot of choices to tweak DTMF, including sending it inband
> as audio tones. If you haven't already, get the thick Cisco manual
> that shows all the choices for DTMF that correspond to your gear.
>
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