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DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance for csi systems
1-140Troubleshooting Multimedia Call Handling (MMCH)
1
Video Never Switches to a Particular Party
Description
Verify that the endpoint is a valid video source as described in the “
Calls
Terminate with No Video” section above. If it is, then the audio from the endpoint
may not have sufficient voice signal for the hardware to determine the parties at
the endpoint are speaking. Check the
Talk
field on page three of the Status
Conference X Endpoint Y form to see if the
talking bit
is
y
. Next, check the
audio by standing adjacent to the microphone and speaking at a normal level.
Solution
If the audio is not muffled:
1. Use the
status conference
command to determine which port on the
TN788B (VC board) is connected to this endpoint.
2. Check the VC (TN788B) board using the
test board xxyy long
command.
3. Drop the call.
4. Find another available port, then:
a. Busyout the port to which the endpoint was connected.
b. Make another call to the same conference. If the problem corrects
itself, then the previous port may be bad. If there are other VC
boards with sufficient available ports to replace calls on the current
VC, then pull the board that has the bad endpoint on it (the
status
conference
command displays the encoder port associated with
the call). The system will automatically reestablish the VC
connections without dropping the call. If this fixes the problem, then
replace the board, as it has at least one bad port. Reseating the
board may temporarily fix the problem due to the hard reset done to
the board.
Audio Echo
Echo in conference calls, particularly those with large delay characteristics, is
totally disruptive. When Voice Activated Switching is taken into account, the
effects are disastrous. Various arrangements of the microphone(s) and room
speaker(s) may be needed.
For some Lucent Technologies Vistium endpoints, if an external speaker is
attached or was attached when the system was last rebooted, this endpoint will
cause audio echo throughout the conference. First, isolate the offending
endpoint by asking each endpoint to mute, one at a time, until the echo
disappears.