• On SIP phone, the DN configuration will overwrite the phone configuration

• SCCP
• Can also be configure on the physical IP Phone

ephone-dn 1
  call-forward all <DN>

• SIP

voice register pool 1 
! *** OR
voice register dn 1
!
  call-forward b2bua all <DN>

ephone-dn 1
  call-forward busy <DN>

• Configure CFB on the line

voice register dn 1
  call-forward b2bua busy <DN>

• For SIP phones, the number of channels supported is limited by the amount of memory on the phone.
• Hence we need to limit the number of incoming call on the line to trigger a CFB
  • Applies to all the phones that the line is applied to
  • <number> is the max number of incoming call this line can handle before sending it to CFB.

voice register dn 1
  huntstop channel <number>

• Alternatively we can limit the number of incoming call on the phone
  • Applies to the physical phone
  • <number> is the max number of incoming call this phone can handle before sending it to CFB.

voice register pool 1
   busy-trigger-per-button <number>

• SCCP
• Default duration is 20s

ephone-dn 1
  call-forward noan <DN> timeout <seconds>

• SIP

voice register pool 1 
! *** OR
voice register dn 1
!
  call-forward b2bua noan <DN> timeout <secs>

• SIP
• If the DN or phone is not registered

voice register pool 1 
! *** OR
voice register dn 1
!
  call-forward b2bua unreachable <DN>

• SCCP
• Use to prevent toll fraud
• Setting length = 0 will dim out the CFWD button on the phone and not available

ephone-dn 1
  call-forward max-length <length>

• Matches the calling party. If matches will send a H.450.3 to request the calling party to place the call again to the call again to the forward to destination?
• If the calling party does not support H.450.3 then the call is dropped.

telephony-service
  call-forward pattern <pattern>

• SIP
• Controls the specific voice mailbox selected in a voice-mail system at the end of a call forwarding exchange
• Specify an alternate mailbox instead of the one associated with this phone or DN.

voice register pool 1 
! *** OR
voice register dn 1
!
  call-forward b2bua mailbox <DN>