This guide explains how to change your number destinations.
Your numbers can either be:

Your numbers will be listed in an international format, with a 44 in place of the preceding 0. For example, 01220 123456 will be listed as 441220123456.
If your calls are being delivered by SIP, the destination must be entered like SIP/01220123456@1.2.3.4
Port can also be entered, ie SIP/01220123456@1.2.3.4:5060
Ensure VOIP_CALL is set to YES.
If you are forwarding calls to another phone number, simply enter the phone number in the destination, ie 01220123456 and set VOIP_CALL to NO.
You can set up to 5 destinations per number, which increases resilience should something happen to your PBX or internet connection. Simply set PRIORITY in the order required. 1 will be the first attempted destination, while 5 will be the last. Each next destination will be attempted if the preceding one times out. (Busy, Unavailable etc will not count).
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