8 Nov
2007
8 Nov
'07
2:10 p.m.
On Thu, 8 Nov 2007, Christian Schlatter wrote:
Chris Heiser wrote:
Interesting. What's bothering me is your /g with AVPs to get parallel
forking. My experience has been that performing parallel forking using
that method results in the failure route getting hit when any branch of
the fork fails, whereas if I have a permanent registration in OpenSER with
multiple entries, it seems like my failure route doesn't get called until
they all fail.
(Can you tell that this has driven me nuts for a while now?)
--Chris
Yeah, I've been taking a hard look at CPL. I
did some fun fancy things
with permanent registrations in openser, and avps, but that's all so
terribly messy. I think a final solution will be something like:
Add some permanent registrations to openser to handle some parallel fork
cases. Everything else could be handled by CPL.
The other nice thing about CPL is I can explicitly upload cpl files for
specific users and not do a ton of lookups for avps, etc...
You can avoid most of the "mess" if you don't do sequential forwarding,
which
is what we are doing at UNC. Our analysis has shown that you can cover 95% of
all "follow-me" user needs with parallel forking.
The upcoming 1.3 version of openser will include a module called H350 which
allows you to store simple call preferences in LDAP
(http://www.openser.org/docs/modules/1.3.x/h350.html#AEN186) which offers
better performance than CPL and still gives you all the routing script
flexibility. Not messy at all, isn't it ;-)
The only situation where you really need sequential forking is for call
center applications, and for that you also need some sort of IVR/MoH in order
to inform the caller about the long ringing time. So I think it is best to
implement this with a b2bua type SIP PBX like asterisk instead of trying to
implement it the pure p2p SIP way.
Sure, I'm walking a fine line, but I think there's a place for small
chains of sequential forking. The uglier stuff comes in when you want to
add conditionals to the process. It seems like CPL could let me do some
of that (or I'll have to write a module that lets you query arbitrary
external data). Think of something simple like "Time of Day" preferences.
--Chris
just my 2c
/Christian
--Chris
On Thu, 8 Nov 2007, Victor Gamov wrote:
What about CPL? I don't play with it in
OpenSER but scenario like this
can be described on CPL.
--
CU,
Victor Gamov
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