We have one-way calling situation. Calls originating from PBX fail when destined to any other endpoint.
To be more precise, when entering 0 (to get on the trunk) on the PBX phone there is an error message displayed 'Unallocated/unassigned number' and there are no MGCP traffic coming into MGC(see attach).
Meanwhile all calls originating from various others endpoints can be successful accomplished when called side is some of the PBX phones.
We do call tests with PBX and Cisco IP phones registered with CUCME on the same 2811 and configured appropriate PRI trunk works perfectly.
We think PRI backhauling is configured well, IPFAS also...
Can someone point us is there any catch we have missed?
Thank you in advance