[SR-Users] [Sems] Solutions to missing BYEs, accounting for them

[Stefan Sayer]

Hi,

Alex Balashov wrote:
> 1) Inline B2BUA in the signaling path of all calls;
> 
> 1a) Make it do SSTs; or
> 1b) Make it relay media, too, and hang up the call (bidirectional BYE) 
 > on RTP receive timeout;

>[...]


> Needless to say, I am interested in the option that requires the least 
> work but still solves the problem in an elegant way from a technical 
> and--dare I say--aesthetic perspective.
you are right; with SEMS this needs some work. I wouldn't say it is a 
lot, as you have all the basic functionality already there, at least 
for 1.a.

> 
> For instance, it seems clear from looking at the SEMS-1.1.1 sources that 
> SSTs are supported in principle in core/plug-in/session_timer. But 
> unless I am missing something, I cannot find anywhere in the sources or 
> examples where it is actually used.
have a look at core/plug-in/echo.

Session timer is implemented as SessionEventHandler (hooks that get 
called for every request received/sent), which you need to add to the 
session e.g. when you create it. In your case you would need to add it 
to both legs of the B2BUA call; e.g. if you start from auth_b2b you'd 
have to add it in both AuthB2BFactory::onInvite and 
AuthB2BDialog::createCalleeSession.

What I'm not sure is whether the configuration of session timer values 
works the way it should (configureModule), possibly you'd need to hack 
this a little.

As for 1.b, SEMS does not yet have an RTP relay mode (only transcode). 
If you are really interested in it, I think we can work on that; 
again, the basic components are there, it needs just adding some 
things here and there.

Regards
Stefan

-- 
Stefan Sayer
VoIP Services Consulting and Development

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