[asterisk-gui] Greandstream IP phone

[Bob Crandell]

The settings that worked for you worked for me, and they are set in the User screen.
 
So thank you sir.
Bob

>>> David Kerr <David at Kerr.net> 8/12/2009 7:15 AM >>>
In the .conf file that you setup the extension for grandstream check for a line...
dtmfmode = 
and try various settings... auto, inband, rfc2833, info

DTMF = Dual Tone Multi Frequency, a technical term for touch tones generated when you press keys on your telephone. dtmfmode setting tells asterisk how to send/expect to receive signals as each key is pressed.

auto means asterisk will try and figure out which method to use.
inband means that an audible tone is send down the voice path... this is susceptible to codec corruption. ulaw/alaw work, but other higher compression codecs most likely will not.
rfc2833 means use the protocol defined in the internet rfc2833 document. This is probably the most widely used method.
info means send a SIP INFO message.

Be sure to test whatever setting you select not just with your own voicemail system, but also with other services at the far end of a trunk. For example, call a company that you know has a touch-tone voice response unit and make sure that your tones are understood. I have found that some SIP trunk services work with some dtmfmodes, but not others. In the worst case scenario it can even depend upon your service providers selection of their backhaul provider... which may mean that it is dependent upon which number you call (so if they route toll free numbers through one carrier, and local calls through another, dtmf could be affected).

Personally, I have found that the only setting I can get to work reliably for me is "inband" with ulaw/alaw codec. But your mileage may vary, and my results could well be a symptom of the particular combination of trunk carriers I use.

David

On Wed, Aug 12, 2009 at 9:34 AM, Bob Crandell <bob at assuredcomp.com> wrote:



I don't know what that means.

Thanks 
Bob 

>>> tom <tomabroad at gmail.com> 8/11/2009 07:47 PM >>>
maybe dtmf?

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