Lucent Technologies MERLIN LEGEND Release 6.0 Maintenance And Troubleshooting Manual page 91

MERLIN LEGEND Communications System Release 6.0
Maintenance and Troubleshooting 555-660-140
Telephone Problems
System Requirements for Touch-Tone Receivers
If these symptoms are present, use the following steps to calculate the system
requirements for touch-tone receivers.
Determine the number of TTRs required for the voice messaging
! 
system (if present) from
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.
Use Table 3–4
! 
system.
Use Column 2 if account codes are not being used.
Use Column 3 if account codes are being used.
Add the number of TTRs obtained in Steps 1 and 3. If the Group
! 
Calling Prompt-Based Overflow setting (Release 6.0 and later
systems) is not being used, go to
If the Group Calling Prompt-Based Overflow setting is being used,
! 
add one TTR for each delay announcement device assigned to a
calling group that is using the setting.
Use Table 3–5
! 
Compare the numbers obtained in Steps 4 and 5 to see if additional
! 
TTRs need to be added.
Add a new module if indicated.
! 
See Installation .
A voice messaging system requires a certain number of 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.
In addition, in Release 6.0 and later systems, the use of the Prompt-Based
Overflow setting, which allows callers to request overflow coverage while
Table 3–3.
to determine the number of TTRs required by the
to determine the number of TTRs already supplied.
Step 6.
Issue 1
February 1998
Page 3-9