Divert using a BT standard divert for busy lines, after three rings unanswered, out of office hours or at all times.

It is easy and simply to set up. 

Diverting Process
Switch On ( * ) code ( * ) phone number to divert to ( # )
Check ( * ) ( # ) code ( # )
Switch Off ( # ) code ( # )

Codes What it does
21 Diverts all calls
61 Diverts calls not answered within 15 seconds
67 Diverts calls when you phone is engaged