AT&T 3.0 manual System Requirements for Touch-Tone Receivers

System Requirements for Touch-Tone Receivers

2Estimate 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.

3Use Table 3-4to 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.

4Add the number of TTRs obtained in Steps 1 and 3.

5Use Table 3-5to determine the number of TTRs already supplied.

6Compare the numbers obtained in Steps 4 and 5 to see if additional TTRs need to be added.

7Add 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