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Splitting load across 2 Unity Servers

Hello All,<br> I have a customer who is looking to split his voicemail port count over two Unity Servers.<br>He figures that:<br>1) The first server will handle the load of his Auto-Attendant functionality<br>2) The second server will handle the load of his VoiceMail functionality<br><br>He expects that he will use a 16-port system for AA, and a 8-port system for VM.<br><br>Is this a supportable configuration within a CallManager environment?<br><br>Are there any issues to be aware of?<br><br>TIA,<br> Pat<br><br><br>


Re: Splitting load across 2 Unity Servers

Hi Pat.

No, this configuration is not supported. Unity is not cluster-capable at this point and that’s really what’s needed to make this fly. Unity 2.4.x simply does not have load balancing or proper hot-fail over capabilities at this point (the “simple” fail over is just that… very crude).

The problem with handing auto attendant on one box and voice mail on another is that auto attendant functions require knowledge of users created on the voice mail box. For instance alpha directory functionality (one of the key things you’ll want to do for outside callers) requires we know the names/extensions/transfer strings of the subscribers on the voice mail box.

Further, if someone dials into the auto attendant box and wants to dial the extension number of a user (even if they don’t go through the alpha directory) it’ll need to know the Ids of all the subscribers and call handlers on the other Unity server to do that right.

The short story is that this will be handled smoother in 3.0 with dialing domain support and the like.

Jeff Lindborg
Unity Product Architect/Answer Monkey
Cisco Systems (new page for Unity support tools and scripts)