[OpenSER-Users] Forking Madness

[Christian Schlatter]

Chris Heiser wrote:
> 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.

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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> 
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