How to transfer or forward to voicemail mailboxes

Assume you have 3 digit extensions 100 - 199, then you can put something like this in the dialplan to allow users to transfer calls directly to a mailbox by dialing * followed by an extension number:

exten => _*1XX,1,Voicemail(u${EXTEN:1})
exten => _*1XX,2,Hangup

Users may also forward their phones to these extensions.

How to setup an extension for voicemail retreival

If users are calling from their own phone, and the voicemail mailbox IDs are the same as the extension numbers, this allows all users to to dial a common extension number to directly access thier voicemail mailbox.

exten => 199,1,VoicemailMain(s${CALLERIDNUM})
exten => 199,2,Hangup

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