| Failure: The physical wire is on the loss of synchronous condition.
Check the physical connectivity.
Failure: E1 is unable to enter the multi-frames condition.
The physical wire is on the loss of synchronous condition, the configuration problem.
Failure: Make phone call through E1, but no sound after dialing up.
The physical wire is on the loss of synchronous condition, the configuration problem.
Failure: Some phone call of PBX needs to dial up for several times.
Adjust through the calling.
Failure: No dialing tone after picking up the telephone.
Check hardware and configuration.
Failure: Hear the busy tone immediately after picking up the telephone.
Check configuration.
Failure: The host dialing number of PBX, PSTN can not be displayed.
Check host dialing operation of PBX, PSTN.
Failure: No second dial tone of VOS.
Check static document and pbx.
Failure: VOS port can not identify busy tone, which causes the non-hanging up.
Check PBX busy tone.
Failure: Gateway can not register in gatekeeper.
Check configuration. | 
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