Unfortunately my time to reverse engineer this problem right now is low but my
temporary solution's cons are pushing me to jump into the code and fix the problem.
As a workaround you can set your Cisco phones to disable out-of-band DTMF and
on Asterisk set the sip.conf entries for these phones to use inband DTMF. You will
be able to get external IVR to work but you will probably have to use something like
G.711 so the quality is hight enough. The codec usage depends on your configuration
and you may be able to get away with some compression. I currently have some Cisco
7960's for phones and an Audiocodes 4-port FXO gateway installed. When using
out-of-band DTMF, Asterisk DTMF functions worked fine. I could not hear DTMF
between the Cisco 7960s (who really cares). The real problem was that I could not
get DTMF relayed from the Cisco 7960 to PSTN via Asterisk and the Audiocodes.
This is where I have to sit down with a packet sniffer and debug logs to see what is going
on with the RTP. I need to know if the problem is in Asterisk relaying the phone events
containing DTMF or if it is the Audiocodes not generating DTMF tones on the analog side.
Hope this rambling helps. Maybe it will prompt someone else to chime in with a solution. :)
Matthew Enger wrote:
Hello,
I am setting up 2 ISDN 4 linux cards and have had great success now that I have got over the initial problems with : and / characters.
The only problem I am experiencing now is the sending of DTMF tones over the line to a remote IVR system.
If I dial SIP (Cisco 7905 and 7940) to a number over the line, no DTMF tones are heard. I dialed my own home phone and tried it, no matter which button i pressed, no tones came out.
However when I dial voicemail, the buttons work fine.
Is this a problem with asterisk not putting the tones onto i4l?
Thanks,
Matthew Enger <[EMAIL PROTECTED]> Xintegration
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