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System Requirements
for Touch-Tone Receivers
2 Estimate the hourly call volume for calls originating from single-line
telephones, incoming calls on remote access and Direct Inward Dial (DID)
lines, and calls on tie lines.
3 Use Table 3-4 to determine the number of TTRs required by the system.
■ Use Column 2 if account codes are not being used.
■ Use Column 3 if account codes are being used.
4 Add the number of TTRs obtained in Steps 1 and 3.
5 Use Table 3-5 to determine the number of TTRs already supplied.
6 Compare the numbers obtained in Steps 4 and 5 to see if additional TTRs
need to be added.
7 Add a new module if indicated.
See Installation.
A voice messaging system requires a certain number of touch-tone receivers,
(TTRs), in addition to any system requirements for TTRs. The number of TTRs
required by the voice messaging system depends on the number of ports
used by the voice messaging system.
Table 3–3. TTRs Required by VMS
Number of VMS Ports
Number of TTRs Required
1
1
2
1
3
2
4
2
6
3
8
4
12
6
Telephone Problems 3–9