User Guide SIP-T22P IP Phone 
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3.  Enter the numbers in the DND Authorized Numbers field. 
For multiple numbers, enter a comma between every two numbers. 
 
4.  Click Confirm to accept the change. 
When DND is enabled on the phone, the phone can still receive incoming calls from 
the numbers specified in the DND Authorized Numbers field. 
Note 
You can configure your phone to forward incoming calls to another party by the static 
forwarding. You can also forward calls while your phone is ringing, refer to the dynamic 
forwarding. 
Static Forwarding 
Three types of static forwarding: 
  Always Forward: Incoming calls are immediately forwarded. 
  Busy Forward: Incoming calls are immediately forwarded if the phone is busy. 
  No Answer Forward: Incoming calls are forwarded if not answered after a period