AT&T SYSTEM 25 Manual page 56

The Forwarding feature may be used to send calls to another voice terminal or, if allowed
by system administration, to an outside number. Forwarding is similar to Following, but
Forwarding is usually activated from the user's own voice terminal, while Following is
activated from the phone that will be the new, temporary destination for calls. Either
Forwarding or Following (but not both) can be active for a particular PDC. For information
on how to use Following, see the entry titled "Following" on page 2-41.
Unanswered calls forwarded to a station inside System 25 return to the forwarding station
for coverage. Calls forwarded to an outside station that does not answer or is busy do not
return to the forwarding station.
Stations with Forced Account Code Entry (FACE) administered for
calls to any outside numbers. Stations with FACE administered for "dial 0 or 1" calls cannot
forward calls to "dial 0 or 1" outside calls.
If Forwarding is activated from a BRIDGED ACCESS button, only calls from that bridging
station will be forwarded.
Remote Access Forwarding
If the Remote Access feature has been set up (with Barrier Codes), a remote caller can activate
Forwarding from a System 25 station to an outside number. Remote Forwarding to other
inside stations is not allowed.
After dialing the Remote Access trunk and Barrier Code, the caller receives second dial tone.
The caller then enters access code #70 and the PDC of the forwarding station; confirmation
tone followed by silence is returned if a valid PDC was dialed. Finally, the remote caller dials
the outside forward-to number and hears confirmation tone.
To cancel Forwarding, the remote caller repeats the activation procedure but substitutes "0"
for the outside forward-to number.
Forwarding
calls cannot forward
all
Forwarding 2-43