[asterisk-users] How may SIP 183 messages a caller receives when many callee rings?

[Joshua Colp]

Rodrigo Pimenta Carvalho wrote:
> Hi.
>
> I have a beginner conceptual question about Asterisk:
>
> Let's suppose that there are 4 softphones registered in my Asterisk
> and all of them are currently online. In addiction , there is no
> call.
>
> Suddenly, one of these softphones  sends a SIP message to the
> Asterisk. In this case the dialplan will execute the instruction  '
> exten =>  2005,1,Dial(SIP/2000&SIP/2001&SIP/2002, 30) '
>
> All softphones (2000, 2001 and 2002) will ring. These are proprietary
> softphones and all of then will reply with SIP 183 message. SIP 183
> will contain SDP with media information.
>
> The question is:
>
> Will the caller receive SIP 183  from each callee? That is, will it
> receive 3 SIP 183 messages? It is important to the caller receives a
> SIP 183 message from each callee, because this caller needs to send
> early media (video) to every callee.
>
> Or, will Asterisk send just one message SIP 183 to the caller, with
> some kind of generic SDP message?

Asterisk isn't a proxy, so it won't forward all 3 and it won't forward 
media from all 3. Right now the Dial application is simple and just 
doesn't forward media in this scenario.

-- 
Joshua Colp
Digium, Inc. | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org