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This topic describes how to analyze and rectify the fault where the ONLY, simultaneous ringing, or sequential ringing service is unavailable.
Symptom
The unified gateway is connected to the peer device through an AT0 trunk. When an outer-office number is configured as an ONLY number, a simultaneous ringing number, or a sequential ringing number, the ONLY, simultaneous ringing, or sequential ringing service is unavailable
Possible Causes
Number dialing is not continuous. As a result, the user number is not completely collected.
Parent Topic: AT0 Trunk Faults