Instruction manual

Features
A touch-tone receiver (TTR) is required to make calls from tip/ring equipment or
to use the Remote Access feature. TTRs are provided on 400, 400 GS/LS/TTR,
800 DID, 008 OPT, and 012 modules. Normally, these TTRs are sufficient to
handle the calls originated from these modules. However, additional TTRs may
be needed to support the following services:
■ Tie trunks and DS1 emulated tie trunks set for DTMF signaling
■ Remote Access
■ Account Code Entry
■ IS-II/III AUDIX Voice Power
■ IS-II/III Integrated Voice Power Automated Attendant
■ IS-III Fax Attendant
■ MERLIN MAIL
■ MERLIN Attendant
If more TTRs are needed to support these services, 400 GS/LS/TTR modules
can be added (each module provides four TTRs). Table 36 shows the
estimated number of TTRs needed, depending on the call volume and the type
of service. Table 36 is based on the assumption that the system already has
basic telephones, Remote Access, and tie trunks.
Table 36. Number of TTRs Required
Calls per Hour No Acct Codes Acct Codes
Acct Codes
or or VMS/AA
and VMS/AA
VMS/AA
110
2
4
6
180 4 6
8
350 4 8 10
420 6 8 10
610 6 10 12
710 8 10 14
The TTR is allocated for 15 seconds at the beginning of the call and decreases
to 5 seconds as the number of digits dialed increases. Each time the user
presses another digit, the TTR timer decreases. If the user does not dial a digit
within the time frame, the TTR is removed from the call and, after about 24
seconds, the call is disconnected and the user hears a recording or a fast busy.
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.
482 Touch-Tone or Rotary Signaling