Touch-Tone Receivers Required By Voice Messaging Systems - Lucent Technologies MERLIN LEGEND Release 6.0 System Planning Manual

MERLIN LEGEND Communications System Release 6.0
System Planning 555-660-112
2 Control Unit Configuration
Numbering the System
NOTE: NOTE: NOTE:
A VMS cannot be directly connected to the 008 OPT module. However, the
TTRs supplied by the 008 OPT module can be used by the VMS.
A VMS requires a certain number of TTRs, in addition to any system requirements
for TTRs. The number of TTRs required by a VMS depends on the number of
ports used by the VMS (see Table 2–3).
Table 2-3.
Number of VMS Ports
The number of TTRs required by the system depends on the following:
Call volume for all incoming calls on remote access, direct inward dial
(DID) trunks, and T1 data channels (planning information about trunks is
provided in Chapter 3, Lines/Trunks), and outgoing calls on single-line
telephones and tie lines.
If account codes are used, additional TTRs are required for the single-line
telephones.
If a VMS is used, additional TTRs are required for each port used by the
VMS.
If using the Direct Group Calling (DGC) Prompt Based Overflow feature,
each Delay Announcement Unit (DAU) that is physically attached to the
calling group will have one TTR allocated while the announcement unit is
playing the message.
Table 2–4 gives estimates for the total number of TTRs required in the system
based on call volume and whether the system uses account codes. The call
volume in this table includes all calls originating from single-line telephones, calls
on tie lines, incoming remote access and direct inward dial (DID) calls.

Touch-Tone Receivers Required by Voice Messaging Systems

Number of TTRs
1
2
3
4
6
8
12
Required
1
1
2
2
3
4
6
Issue 1
February 1998
Page 2-17