Use Call Forward to redirect calls from a particular extension to an alternate destination.
The alternate destination can be another extension, an external phone number such as a cell phone, or various other possibilities.

1. Unconditional Forwarding
2. On Busy - If enabled, it overrides the value of voicemail enabling in extension.
3. No Answer - If enabled, it overrides the value of voicemail enabling in extension.
4. Not Registered - If endpoint is not reachable, forward to this destination before going to voicemail.