[Freeswitch-users] SIP 100 response and media

[Boris Kovalenko]

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 at tagnet.ru 
> <mailto: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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