Private Network Considerations; Symptoms Indicating Need For More Ttrs - Avaya MERLIN MAGIX Maintenance And Troubleshooting Manual

Table 3-7. TTRs Required for Secondary Delay Announcement Devices When Using
Prompt-Based Overflow
Number of Devices

Private Network Considerations

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. 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.

Symptoms Indicating Need for More TTRs

The following symptoms indicate that the system needs more TTRs.
Single-line telephone users do not get dial tone when they lift the handset to dial out.
I
The voice messaging system fails to transfer calls.
I
Calls fail to ring or go to coverage prematurely.
I
Reorder tone on UDP/ARS calls using tandem tie trunks.
I
Delay in MWL tie trunks when tie trunks are available.
I
1
2
3
4
5
6
7
8
9
10 or more
Telephone Problems
Number of TTRs Required
1
1
1
2
2
2
3
3
3
4
3
3
Touch Tone Receiver Problems
3-11