Todd Weiser wrote:
We recently changed our asterisk system to begin using G.729a as the primary codec. We have a Cisco 1700-series router which connects to the PSTN via FXO ports, along with Cisco 7940 SIP phones. Everything is working great, except... When an inbound caller calls into our system, they hear an IVR. When the caller dials an ext (SIP phone), the ringing progress tone is choppy/distorted... However, the voice call itself sounds fine. Asterisk, the Cisco phone, and the call gateway are all configured to use rfc2833. From my research, asterisk generates progress tones out-of-band (I think) unless turned on. We don't have any problems with the progress tones when G.711u is used. Any help/ideas would be greatly appreciated.
Once the call has been answered (IVR, etc), then Asterisk will have to send the ringing sound inband. G729 distorts tones like DTMF and ringback.
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