Comdial Executech User Manual page 17

Automatic
This feature allows a user to move from Ilne to line without having
to press the hold key to place any current calls on hold
RESULTS: Active line will automatically go on hold.
Voice Signal Blocking
To block voice calls.
RESULTS: All intercom calls will now be tone Calls.
To un-block voice calls,
Recall/Flash
Flash
(PBX, Centrex
require this feature.)
If your system has been configured for flash,
Recall
If your system has been configured for recall,
receive a new dial tone for another call.
NOTE: System can be configured for flash
or recall but not for both.
and custom calling services may