Yosin EVM-2030A, Руководство по программированию

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7. Troubleshooting
This chapter describes some problems, possible causes, and what to do when they occur.
Problems Possible cause and solution
The EVM cannot answer
all or some incoming
calls.

Check the output voltages of the power transformer if the POW
indicator is dark or not flashing.

Check the wires between the PBX and the EVM.

Perhaps you have not done the PBX programming of transferring
incoming calls to the EVM.

If the PBX replies a busy tone to the caller dialing the phone
number of a Line port in fact that is idle, you may set SYS_4_7 _[1]
for using port detection feature.
The EVM cannot
immediately answer the
incoming phone calls.

This is normal because the PBX and the EVM need time to detect
an incoming ring. You may set SYS_3_1 _[0] and SYS_3_2 _[0], to
improve the delay.
When a call is answered,
the calling person cannot
immediately hear the
called person speech.

This is normal in using Supervised Transfer. Shortening the pause
between the ringback tone cycles from the PBX is a solution.
Otherwise, use the Unsupervised Transfer feature.

Perhaps the Ringback Tone Cycle Lengths have not been set up yet.
The EVM always replies a
wrong-number message to
the caller after
transferring a call and
retrieving; in fact, the
called party is busy.

Interchange the values of Error Tone Cycle Lengths (SYS_7_4) and
the values of Busy Tone Cycle Lengths (SYS_7_5).
The EVM hangs up the
call after having prompted
a caller to hold on for
three times.

Perhaps the Hook-Flash length ( SYS_7_1 ) is too short.

If the frequency of the dialtone of the PBX is not of 300~640 Hz,
you must set SYS_4_8 _[2] for the Tone Detection Bandwidth.

Occasional occurrence – see Note 1.
The EVM always
announces the Wrong
Number message when
reconnecting any caller.

Perhaps there is a feature code should be dialed before the phone
number of an inward transfer. SYS_6_1 is used to specify such a
feature code.

Perhaps the Dialing-way option specified in SYS_5_1 is incorrect.

Occasional occurrence – see Note 1.
The EVM always hangs
up immediately after
requesting the callers
'hold on'.

Perhaps the Hook-Flash length ( SYS_7_1 ) is too long to put callers
on hold.