I answered my own question. My objective was reached with a simple
return statement on line 4384 of chan_sip.c in asterisk 1.2.9.1 ftp
download. The effect that this has is that asterisk will return a 200
OK that indicates in the SDP that only inband DTMF is supported. My
carrier detects this and their NexTone Session Switch sends out dtmf
inband.
It sucks having to force asterisk to operate in this manner, but
hopefully asterisk implementation of rfc2833 will get the bugs worked
out, if they are in fact bugs, and not design desicions.
Stagg Shelton wrote:
I'm trying to figure out a way around a problem that I'm having. My
carrier sends me a SIP INVITE that indicates that the dtmf modes
available are inband (0), and rfc2833 (101). My asterisk server
(1.2.9.1) sends back a 200 OK message and shows in its SDP Media
Description that we accept inband (0) and rfc2833 (101). My carrier
therefore sends all DTMF via rfc2833 which obviously causes problems
since asterisk is configured for inband.
I've tried going pure rfc2833 with the carrier, and am having DTMF
related problems. From the research that I have done with my issue it
seems to be a problem with the way asterisk sends the rfc2833 packets
out at nearly the same time. Altering the timing that asterisk uses
to send the rfc2833 packets seems too deeply seated in asterisk. I
therefore have settled on the idea on using inband for dtmf. My
termination tests using inband have been successful.
So here is what i think will solve my particular problem. I just want
to respond with a 200 OK that does not contain anything about rfc2833
in the SDP. Is this fairly doable. I've been diging through
chan_sip.c and think I could just make a couple of modifications to
make asterisk do what I need it to. I'm hoping to have someone who is
familiar with chan_sip.c enlighten me as to whether or not this can be
done, and what functions I would need to modify in order to make it
happen.
Thank You
Stagg Shelton
www.oneringnetworks.com
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