2009/2/24 M. Ranganathan <[email protected]>:

> Please study the architecture of sipx. Services are User Agents and
> not Back to Back User Agents. There is a difference. These are "Common
> Services".

It sounds really interesting. Could I have a link to a documentation
explaining the difference between "User Agent services" and "B2BUA
services"? I can't imagine it.
I've found some pages:
  
http://sipx-wiki.calivia.com/index.php/SipX_SW_Architecture_&_Library_Dependencies
  http://sipx-wiki.calivia.com/index.php/Architecture_Diagram
but no a real specification about "User Agent services".

For example:
- Our PBX receives a call from our SIP-PSTN provider and we "route" it
to an announcement server.
- After that the PBX routes it to extension 200.
- If there is no reply during 30 seconds the call is routed to extension 201.

I would really like to know how to implement this simple behaviour
without using a B2BUA.

Thanks a lot.

-- 
Iñaki Baz Castillo
<[email protected]>

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