Distinctive Ring – Allows you to set a different ring tone for different numbers.
CNAM Prefix – Will prefix the calling name of inbound calls to this Phone Number with an entry here. This can help users identify which number a call came in through.
Extension – This is the destination the number rings to. The destination can be either a single extension, a Group, or an IVR (menu).
PBX Location – A number can be associated with a single location. This specifies which location it is associated with. A location is not mandatory.
Forward Destination – Bypass routing to extension and instead send calls to this number when forward is checked.