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MERLIN LEGEND Communications System Release 6.1
Network Reference
555-661-150
Issue 1
August 1998
Touch-Tone Receiver Requirements
Page D-2System Requirements for Touch-Tone Receivers
D
Table D–1. TTRs Required by VMS/AA
*If a 12-port MERLIN LEGEND Enhanced Service Center is used, 8 TTRs are required.
Table D–2 estimates the total number of TTRs required in the system, based on
call volume and whether the system uses account codes. The call volume per
hour in this table includes all calls originating from single-line telephones, calls on
tie lines, incoming remote access and DID calls.
NOTE:
You must consider the call traffic across a private network when estimating
the number of required TTRs. This includes calls on analog tandem tie
trunks and T1-emulated tandem tie trunks. In addition, if your private
network includes Centralized Voice Messaging, you must consider the call
traffic coming across the private network for the voice messaging system
and the TTRs required for the updating of Message Waiting lights (Release
6.1 or later systems). For this updating, a TTR is required at the sending
end and the receiving end. If the systems in the private network are
connected by PRI trunks, no additional TTRs are needed.
Number of VMS Ports Number of TTRs Required
11
21
32
42
63
84
12* 6*
18 8