Brett List wrote:
My SIP Provider (A large major carrier) passes me calls this way. And
no, they won't disable early media and provide an appropriate
supervision code.
In fact, all carriers we've tested have transmitted the call this way.
Even my cell phone gives me the tri-tone without "connecting"
In my part of the world, the telcos will drop the call immediately and
return the cause code.
Yes, chan_sip would need to be modifed. That is the work I am requesting.
The problem with goertzel detection in G.729 is not trivial. Too much
spectral energy was lost in the transcoding. I'm speaking from
experience with DTMF detection in G.729.
For what it's worth, I've attempted to modify chan_sip in the
sip_rtp_read func to include adding a dsp with ast_dsp_new, converting
to SLINEAR with ast_set_read_format and then passing it to
ast_dsp_call_progress. But it doesn't seem to be doing anything at
all.. I've been performing my test on G.711.
Your logic is sound. Did you dump out the return values?
Leo
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