If you want to configure the hunting group to forward the calls to a voice mail in case of no answer please follow the steps described below.
This is how to configure the hunting group to forward the calls to a voice mail in case of no answer:
You need to set "No answer switch to dn or ums" as following:

This parameter indicates whether to forward an incoming call to another phone number or to the hunt group's voice mailbox when no member in the hunt group answers the call.
If the voice mailbox service is not configured and you set this parameter to Yes, incoming calls can be forwarded only to another phone number.


