====== CCME Call Forward ======
  * On SIP phone, the DN configuration will overwrite the phone configuration

===== Call Forward All =====
  * SCCP
  * Can also be configure on the physical IP Phone
<code>
ephone-dn 1
  call-forward all <DN>
</code>

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

===== Call Forward Busy =====

==== SCCP ====
<code>
ephone-dn 1
  call-forward busy <DN>
</code>

==== SIP ====
  * Configure CFB on the line  
<code>
voice register dn 1
  call-forward b2bua busy <DN>
</code>

  * 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.
<code>
voice register dn 1
  huntstop channel <number>
</code>

  * 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.
<code>
voice register pool 1
   busy-trigger-per-button <number>
</code>

===== Call Forward No Answer =====
  * SCCP
  * Default duration is 20s
<code>
ephone-dn 1
  call-forward noan <DN> timeout <seconds>
</code>

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

===== Call Forward Unreachable =====
  * SIP
  * If the DN or phone is not registered
<code>
voice register pool 1 
! *** OR
voice register dn 1
!
  call-forward b2bua unreachable <DN>
</code>

===== Call Forward Max Length =====
  * SCCP
  * Use to prevent toll fraud
  * Setting length = 0 will dim out the CFWD button on the phone and not available
<code>
ephone-dn 1
  call-forward max-length <length>
</code>

===== Call Forward Pattern =====
  * 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.
<code>
telephony-service
  call-forward pattern <pattern>
</code>

===== Call Forward Mailbox =====
  * 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.
<code>
voice register pool 1 
! *** OR
voice register dn 1
!
  call-forward b2bua mailbox <DN>
</code>