User Guide for the SIP-T23P/G IP Phone 
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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 through static 
forwarding. You can also forward calls while your phone is ringing; refer to 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 
of time. 
You can enable/disable call forward for the phone system, or you can customize call 
forward for each or all accounts. Two call forward modes: 
DND authorized number is configurable via web user interface only.