Untiy Integrating with 2 PBX's and 1 Callmanager

[thomas.carbaugh]

I have a customer that needs to have 2 different Avaya PBX's and 1 callmanager integraded to the same Unity. Is this possible? I know we can do dual integration with one avaya and 1 callmanager but I cannot find a document that says it can be done with more than 2 PBX's

[eschulz]

Unity will not be able to connect direct to both Avaya PBXs.

To do centralized voicemail in this environment you'll need at least one of the Avaya's tightly integrated with either the other Avaya or CCM. By 'tightly' integrated I mean the trunk between them needs to pass sufficient info for centralized voicemail. RDNIS and MWI are the two big ones. For example, a QSIG trunk with supplementary services should be able to provide this. Avaya also has their own inter-PBX networking protocol, DCS I think, which is capable of supporting centralized voicemail.

-Eric