Hello! Yes, this is all. INVITE, 100 and RTP. No other SIP messages. So my knowledge of SIP if right. And customer lies to me or forgot to configure something :)
Is that all the signalling?
100 Trying only acknowledges the INVITE.
That *may* be followed by 183 or 180 which'll indicate ringing. The Cisco would only be able to send early media if that was a 183/SDP or 180/SDP.
The voice will only start when it sends 200/SDP which is when the call is answered.
-Steve
On 30 June 2011 06:00, Boris Kovalenko <boris@tagnet.ru <mailto:boris@tagnet.ru>> wrote:
Hello!
I have a customers with Cisco 2821 which want to use IVR on it. He has configured Cisco and told me there is no voice when number is called. The configuration is:
Cisco 2821 <-- FreeSwitch (full proxy mode) --> PSTN
I looked at tcpdump and the call flow is: FS (INVITE) --> Cisco 2821 Cisco 2821 (100 Trying) --> FS Cisco 2821 (RTP) --> FS
I think the call flow is wrong in that case and SIP100 can not go throught Freeswitch (http://jdrosen.net/papers/draft-donovan-mmusic-183-00.txt) and there should be SIP180 to get it work. But customers said this is OK and he has no troubles with same configuration with other provider. What may I do in this sutiation? Any specific Freeswitch configuration?
P.S. FreeSWITCH Version 1.0.head (git-1c95ad9 2011-01-20 22-43-50 -0300)
-- Regards, Boris
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