AT&T MERLIN LEGEND Release 4.0 Feature Reference page 561

Feature Reference
The system is factory-set to generate touch-tone signals for all trunks, except tie
trunks, when users dial outside calls. The factory setting can be changed for
individual rotary trunks so that touch-tone signals are converted to rotary pulses
for transmission to the central office.
Rotary signaling can be set for Delay or No Delay. Delay is the factory setting; it
makes the rotary pulse inaudible to the telephone user and delays sending the
dialed number from the control unit to the trunk until the user is finished dialing.
Considerations and Constraints
Tie trunks are set up either to send signals to or receive signals from another
PBX, or they are set up to be bidirectional, that is, to send and receive signals. If
the system has bidirectional tie trunks, the signaling can be set for both
directions independently. For example, outgoing (outmode) signaling can be
rotary and incoming (inmode) can be touch-tone. Consult the local telephone
company for more information.
The audible feedback for touch tones generated when a user presses a dialpad
button can be heard by any user who shares a personal line or a Shared SA
button with the telephone that is used to make a call. Therefore, when dialing
confidential numbers such as passwords or account information, the user
should take precautions, such as activating Privacy, to prevent others from
hearing the touch tones.
Touch-tone dial mode cannot be programmed for DID trunks that are immediate
start.
Touch-tone dial mode cannot be programmed for incoming, immediate tie
trunks.
Touch-tone, single-line telephone users cannot make calls using individual
trunks programmed for rotary operation. The touch-tone signals generated from
the telephone while dialing are transmitted to the central office at the same time
the rotary signals are sent by the system. The central office receives both
signals and cannot process the call.
Mode Differences
In Behind Switch mode, the factory setting for rotary signaling should be
changed to No Delay.
Touch-Tone or Rotary Signaling
561