12 Jun
2008
12 Jun
'08
4:33 p.m.
El Thursday 12 June 2008 14:38:44 David Villasmil escribió:
No, Asterisk is a bad example for this case since doesn't provide
SessionTimers functions and so.
In fact I'm not suggesting a specific product, but you could try other B2BUA
more SIP compliants and develop a B2BUA between OpenSer and gateways that
implements SessionTimers. Of course it's not an easy task.
You can take a look at those projects:
http://www.b2bua.org/
http://www.resiprocate.org/Main_Page
https://sailfin.dev.java.net/
http://www.opensipstack.org/sbc_man_content.html
OpenSer is a statefull proxy, it shouldn't control dialogs. With "dialog"
module you can do things but obviously is not so complete as you need.
The problem is
that you are addressing the problem in a privative way
while there are RFC's and techniques for that. For your proposal using
Session Timers should be the best option,
Are you talking, i.e. Asterisk? (at last one
of both endpoinds). OpenSer cannot send it since it is a
proxy so a B2BUA or gateway should doit.
IMHO you are addressing the problem in the wrong place (but it could work
of
course).
I see what you're saying, problem with this is I don't WANT to HAVE to use
an asterisk or whatever... I want to depend only on Openser. I believe I can be done with session timers, as you
say. What I Don't KNOW
is whether there is a timer to ask the UAC to send us a kind of
"keep-alive" message. I don't know what that message is called, or what
module creates it.
No one. The mos similar function in OpenSer is the registrar module sending
NOT in-dialog OPTIONS to mantain NAT keepalive.
The thing is:
What module's function to use to make the UAC send uns a "keep-alive"
whilst in a dialog every X senconds, setting a timeout for that keep-alive
to be sent and resetting it everytime it's received.
There is not that function/module for now. :(
--
Iñaki Baz Castillo
ibc(a)in.ilimit.es