[Serusers] Summary of using SER as an app server

[Jiri Kuthan]

At 01:34 PM 10/5/2004, Franklin, Allen wrote:
>Can I use the app server functionality of SER to initiate a SIP call?
>
>In order to initiate a SIP call, the app needs to be able to specify RTP
>parameters to go into SDP bodies of SIP messages, and to have access to
>the SDP info returned by the callee.
>
>Some entity (SER or the app?) needs to do SDP negotiation.
>
>I don't see mention of this in the SER docs.
>
>Am I asking for something that SER does not support?

Yes. SER is a proxy server -- it cannot initiate calls. Only a B2BUA 
such as AA can.

-jiri


>-----Original Message-----
>From: Jiri Kuthan [mailto:jiri at iptel.org]
>Sent: Monday, October 04, 2004 7:11 PM
>To: Franklin, Allen; serusers at lists.iptel.org
>Subject: Re: [Serusers] Summary of using SER as an app server
>
>
>At 12:51 AM 10/5/2004, Franklin, Allen wrote:
>>A very basic hook is provided that allows a script to call functions in a user-provided shared library,
>>but this hook is only useful for rewriting the URI of the "current" message.
>
>Thats incorrect. The shlibs can do and do much more than URI rewriting. See module list
>and what they do.
>
>>SER does not allow scripts or app server processes to see or modify the SDP, so an app
>>server process could not be used to initiate a voice call.
>
>There are modules that do SDP mangling. nathelper for example.
>
>>SER does not have a SIP parser as would be found in a traditional SIP stack.
>
>I don't know what a traditional SIP stack is but if you mean something slow
>that SER doesn't have it ;) It is not available as a separate library if you
>mean that.
>
>Otherwise your assessment has been correct. If you are looking for a real
>application server (meaning a stateful call control element) than it is
>not SER. We have AA (www.iptel.org/aa).
>
>-jiri 
>
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--
Jiri Kuthan            http://iptel.org/~jiri/