NEC Univerge SV8500 Operation And Maintenance Manual page 231

<Trouble 3 -Network Busy->
(1) Brief
Network Busy is often displayed on LCD of DtermIP.
(2) Cause
Packets are discarded on network devices.
(3) When Fault Log Collection Function is used
By confirming retransmission times/retransmission failed times from collected logs, it can be determined that
the problem could be caused on network and SV8500/PHD sides.
From memory in a system, it can be determined that the retransmission failed.
By seeing retransmitted NG occurred on two-way, it can be determined that the fault could have occurred on the
network.
<Trouble 4 -Noise, Voice Cut Off- >
(1) Brief
Noise and Voice Cut Off on speech occurred between IP terminals.
(2) Examination Method
The cause of network fault can be analyzed by using Call Log Collection Function and seeing its logs including
information of opponent, speech start time, speech end time, RTP arrival status when noise or no tone is caused
during speech, status of discarded packets, enable/disable of warning tone, and information on end points.
Figure out how to solve the problem in consideration of
other type of logs.
Use speech logs to solve the problem.
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CHAPTER 2 Operations of SV8500 Server