AT&T 3.0 manual Manual Correction of Trunk Problems, Troubleshooting Trunk Symptoms Section

Trunk Errors

Table 5–1. Troubleshooting Trunk Symptoms

Symptom	Section
Incoming calls not being received	Incoming Trunk Problems
Cannot make outgoing calls	Outgoing Trunk Problems
General trunk problems	Manual Correction of Trunk Problems

NOTE:

If the customer reports ethos during conversations on T1 trunks with GS emulation to a toll office, check the system programming for T1 trunks.

The system is not intended to work with GS emulation to a toll office. Tie trunk emulation must be programmed. Program the module to emulate tie trunks to the central office.

Manual Correction of Trunk Problems

If the system cannot seize a trunk even after repeated attempts, you may have to replace the module.

To identify the trunk problem, follow the steps below.

1Check for dial tone at the control unit.

2If you do not hear dial tone, check the error logs and make a trunk test call.

3Check for dial tone at the network interface.

It is sometimes difficult for the customer to detect trunk troubles. If a trunk is down, the system records an error in the error log and takes the trunk out of service. However, if an incoming-only trunk is down, the only sign of trouble is customer complaints that incoming calls are not being received.

Check the error logs for messages about trunk type (such as DID, tie, and T1). Also check the wiring and the system parameters (for example, touch- tone/rotary, toll restriction, and disconnect time interval).

5–2Central Office Problems