Navigation: Fault Management > Troubleshooting Guide > Trunk Faults > AT0 Trunk Faults >
This topic describes how to analyze and rectify the slow call connection fault.
Symptom
The unified gateway is connected to the peer device through an AT0 trunk. When an outer-office user dials the number of an intra-office user, the outer-office user must wait for a period of time before the outer-office user can hear the ring back tone.
Possible Causes
The Direct-Inward-Dialing (DID) service is enabled for the intra-office user. As a result, the outer-office user feels that it takes a long period time to connect the call.
Parent Topic: AT0 Trunk Faults