Environment: zimbra6.0.2 oss linux redhat as5

Somebody who can tell me how to enable voice mail ? The more detailed the better.

I tried :
zmprov mc default zimbraFeatureVoiceEnabled TRUE

and now the voicemail module displayed , but when I click, it shows some errors as follows:

Server error (unknown command sent to server).
method:GetVoiceInfoRequestmsg:unknown document: GetVoiceInfoRequestcode:service.UNKNOWN_DOCUMENTde tail:soap:Sendertrace:btpool0-2109:1257436172267:c646a1ac73873083request:test@do main0_f918940f28cfed950aa3315d828fc0ee94d370b0_696 43d33363a62353065376332382d653936302d346464642d613 635392d6463633533383330343438383b6578703d31333a313 235373630373934393531353b747970653d373a746d61696c6 5723b

Anybody has installed this successfully in zimbra6.0.2 ? Especially the detailed steps,thanks a lot.

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