routing between sessionmanager and multiple cm's

[rene2716]

Hi Guys,

I have a bit of a tough question here.
We have 4 sessionmanagers, 2 cm systems and two incoming sbc public sip trunks.

Incoming public routing is done in systemmanager to strip the digits incoming to form an extension which is routed via a routing patern to both cm's. CM's are configured with local extension first. We are not able to have a closed numberingplan for both cm's so an extention can be on either cm. If an extention is not found on one cm, via udp and aar its routed to the other cm to get to the extension.

Here's the problem, when an extension is dialed which is not known on both cm's the theres a loop because both cm's route it via udp and aar to the other and on and on and on.

we are talking a 25k extension config here so programming all the not known extensions is not an option.

Any routing sugestions?

 

[europe]

Only solution i would see is a tandem config.
So 1 cm that holds th udp plan, route all calls to that tandem cm
The tandem cm has a udp for all extensions thst are in use an forwards the calls to one of the two normal cm systems where the actual stations are.
The unused extension numbers go to an announcement or intercept treatment.
The two normal cm systems keep an udp plan with local first, and then the tandem cm.

The tandem cm could work with only 10 station licenses

Please let me know if the information that was provided is helpfull.
Edwin Plat
A.K.A. Europe