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P100IH ISDN Router
Advanced Phone Services
8-5
There are two methods to activate call forwarding.  The first is exactly the same as on an analog line, i.e.,
you pick up the handset and dial the access code assigned by your telephone company and the number that
you want the calls forwarded. Check with your telephone company for this access code.
The second is with the “phone flash” commands where you pick up the handset and press the flash key
before dialing the following:
Table 8-3 Phone Flash Commands
Command
Meaning
*20*forward-number#
Activate CFB (Call Forwarding Busy)
*21*forward-number#
Activate CFU (Call Forwarding Unconditional)
*22*forward-number#
Activate CFNR (Call Forwarding No Reply)
#20#
Deactivate CFB
#21#
Deactivate CFU
#22#
Deactivate CFNR
Either method should work fine, and you can use whichever one you are most comfortable with.
8.8 Reminder 
Ring
The Prestige sends a single short ring to your telephone every time a call has been forwarded (US switches
only).