Lucent Technologies MERLIN LEGEND Release 6.1 Maintenance And Troubleshooting Manual page 110

MERLIN LEGEND Communications System Release 6.1
Maintenance and Troubleshooting 555-661-140
System Requirements for Touch-Tone Receivers
Estimate the hourly call volume for calls originating from single-line
telephones, incoming calls (including private network tandem tie
trunks) on remote access and Direct Inward Dial (DID) lines, all calls
on tie lines, and calls routed to the voice messaging system.
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.
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
by calling groups, first add the number of TTRs needed for the
primary delay announcement devices assigned to those calling
groups, according to
needed for the secondary delay announcement devices assigned to
those calling groups, according to
NOTE:
If no announcement is used on a primary or secondary delay
announcement device, no TTRs are needed.
to determine the number of TTRs required by the
Table 3–5. Then add the number of TTRs
Step 6.
Table 3–6.
Issue 1
August 1998
Page 3-14