Specifications

Chapter 20 - Troubleshooting Calling Issues
180
Mediatrix 4100
Calling Issues
The following are general calling issues you may encounter.
DESCRIPTION: Impossible to make a call.
If the following happens:
 Dial tone present.
 Power LED lit.
 LAN LED lit.
 POSSIBLE CAUSE: Network communication is not working.
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OLUTION: Check that:
• The LAN cable is securely connected to the Mediatrix 4100 and to the network
connector.
• You did not connect a crossover network cable.
 POSSIBLE CAUSE: Configurable parameters of the Mediatrix 4100 are not set properly.
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OLUTION: Refer to this manual for a complete description of the configurable Mediatrix 4100
parameters.
DESCRIPTION: Unable to establish a call from the Mediatrix 4100 to an endpoint such as an IP phone, a
gateway or another access device.
 POSSIBLE CAUSE: When the Mediatrix 4100 – with its T.38 capability enabled – tries to establish a call
with an endpoint that does not support T.38, this an endpoint rejects the call instead of ignoring the
capability it does not support, i.e., T.38.
SOLUTION: Disable the T.38 capability in the Mediatrix 4100. See “T.38 Fax” on page 149 for more
details.
 POSSIBLE CAUSE: If the unit is running either in MGCP or NCS mode, the silence suppression settings
may not be the same in the MIB and the Call Agent. These settings shall be identical.
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OLUTION:
a. Modify the configuration of the voiceIfG711VoiceActivity DetectionEnable MIB variable to have
the same setting as the Call Agent.
b. Restart the unit.
See “Voice Activity Detection” on page 143 for more details.
Fax Issues
The following gives information pertaining to faxes.
DESCRIPTION: “Poor line condition” error during a fax transmission.
 POSSIBLE CAUSE: The analog transmission between the fax machine and the Mediatrix 4100 is flaky,
preventing the fax transmission to terminate properly. This problem is known to occur with some fax
machines and it can also occur with a few fax modems.