[Freeswitch-users] SIP 100 response and media

[Steven Ayre]

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 at 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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