How to set number of rings before voicemail.
This is a "Class Of Service" function. The out-ot-box default setting is generally 3 rings. However, different extensions can be set to each forward to VM after differing number of rings, but each phone will need to be assigned its own specific Class Of Service and the Call forward timers defined accordingly in those classes of service. Normally your system manager will define several classes of service with different forward-no-answer timers then assign those COS to people who request specific call forward timing. The default is usually 3 rings. Hope this helps
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