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> 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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