Vertical Communications TeleVantage 7.5 - Manual (Page 153)

A PPENDIX C. T ROUBLESHOOTING C-17
3. Restart the TeleVantage Server. This step also starts the Intel Dialogic drivers
automatically.
4. Make an inbound and outbound call.
T1 trunk shows status of ‘No loop current’ in Device Monitor
Simultaneous disconnects on both sides of a two-party connection may change the status of a
T1 trunk in the Administrator Trunks view to ‘No loop current.’ To return the trunk to operation,
restart it manually according to the instructions in “Restarting stations and trunks” in Chapter
12 of Administering TeleVantage.
Troubleshooting problems with analog trunks ________________
This section provides information about the following:
“Analog trunks do not disconnect properly when calls terminate” on page C-17
Analog trunks do not disconnect properly when calls terminate
Analog trunks may not disconnect properly after calls are terminated. The analog trunk may stay
off-hook for minutes after the call terminates, preventing the trunk from being used for inbound
or outbound calls. This may be caused by any of the following.
Q Problem with disconnect tones in TeleVantage. If you have configured TeleVantage
to use disconnect tones, you may need to modify the disconnect tone settings in the
Windows registry. For detailed information, see Administering TeleVantage, Appendix
A, section ‘Defining custom tones.’
Q Problem with how quickly your supplier provides dial tone again after a call has
disconnected.
The supplier’s switch may not be dropping loop current long enough for
TeleVantage to detect the disconnect. If this is the case, decrement the
DXBD_MINLCOFF parameter for your analog trunk boards. For detailed information,
see “VoiceBoard settings” in Appendix A in Administering TeleVantage.
Q Supplier-side configuration problem. Call your supplier’s repair office, explain the
nature of the problem, and then request that your analog lines be configured with ‘CO
Disconnect’ enabled (or set to ‘True’.) This feature is also called ‘Far-End Disconnect’
or ‘Guaranteed Disconnect.’
If your supplier is using a Nortel DMS switch, they must turn on a feature called
‘Disconnect Supervision.’ If this feature is not enabled (which it normally is not), the
Nortel DMS uses a process called ‘kill’ to disconnect the trunk, which requires 45
seconds of inactivity before disconnecting.
Q Line voltage problem. If the loop current on the trunk is out of specification, neither
TeleVantage or the CO may be able to reliably detect hook state. If so, request that your
supplier repair the line.