[Asterisk-Users] SIP and DTMF

[Eric Wieling]

Inband DTMF only really works when using G711 (ulaw or alaw).  If you
are not using G711, you'll have to use OOB DTMF to get it to work.

--Eric

On Fri, 2003-05-23 at 13:12, Avery, Brian wrote:
> Hello, 
> 
> 	I am fairly new to asterisk. I am currently using asterisk as a
> more convenient sip side voicemail system.  
> 
> 	My problem:
> 		I have cisco 7960 phones whose out of band dtmf tones
> are recognized properly(when dtmfmode=rfc2833) by asterisk but whose
> in-band dtmf tones are recognised poorly(when dtmfmode=inband) . For
> example 7999 comes out as 799999, 4242 comes out as 442422 ... etc
> 
> 		I also have a cisco 2600 acting as a router/bridge
> between a Nortel Option 11C pbx and the voip/sip side.  It can only send
> in-band dtmf as far as I can tell (probably because that is how the
> Nortel is forwarding it.
> 
> 	I found the dtmfmode switch to make EITHER one work.  Is there a
> method so that asterisk can deal with both in band and out of band dtmf
> tones at the same time?  is there a reason that it would ever need to
> ignore the out of band ones?
> 
> 
> thanks,
> Brian Avery
> 
> 
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