[Asterisk-Users] inband dtmf on ploycom ip501?

[Chris Miller]

Damon Estep wrote:
> Anyone have any hints on how to get the polycom ip501 to send dtmf
> inband, our upstream providers require inband and the native rfc2833
> format of the polycom does not work.

In order for inband to make it beyond Asterisk, you need to disable 
rfc2833 control in the Polycom config file "sip.cfg" (i.e. via ftp server).

tone.dtmf.rfc2833Control="0"

It appears that although Asterisk recognizes and uses inband dtmf 
internally, rfc2833 is used on the external channel. I noticed this 
behavior when remote IVR systems weren't acknowledging dtmf.

Regards,
	Chris

Chris Miller
President - Rocket Scientist
ScratchSpace Inc.
(831) 621-7928
http://www.scratchspace.com