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CUCM 5 Lookpback trunk seems to work.. no loop detection ?

Hi,

I have a situation, where I send subscriber calls to an external PBX (for enhanced routing) and need to have a fallback to route calls to

local subscribers, if the external pbx fails.

The only way I could do this was with a RouteList / Routegroup, and have the same CUCM system as a loopback trunk.

Now the originating partition and terminating partition are different, when calls go over the looped trunk....

But is this a bug in CUCM 5? Is the SIP stack  not supposed to reject an INVITE that it sent out if it sees it coming back in ?

Ideas / Comments ?

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I changed the config, so that a loop gets created, and CUCM 5 does not seem to prevent it..

I see the max-forwards keep decreasing, and eventually, the call does drop..

        But CUCM does not seem to prevent the loop from being created in the first place !

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