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 sourc e 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 sig nal for the hardware to determine the p arties at
the endpoint are speaking . Check the Talk field on pag e 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 microph one and speaking at a normal lev el.
Solution
If the audio is not muffled:
1. Use the status conference command to determ ine 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, the n:
a. Busyout the port to which the end point was connected .
b. Make another call to the same c onference. If the problem c orrects
itself, then the previous port may b e bad. If there are other VC
boards with sufficient availab le ports to replace c alls on the current
VC, then pull the board that has the b ad endpoint on it (the status
conference command disp lays the encoder por t associated with
the call). The system will automatically reestablish the VC
connections without drop ping the call. If this f ixes the problem, then
replace the board, as it has at least one bad port. Reseating the
board may temporarily fix the p roblem 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 Switc hing is taken into account, the
effects are disastrous. Various arrangements of the microp hone(s) and room
speaker(s) may be needed.
For some Lucent Technologies Vistium endpoints, if an external sp eaker is
attached or was attached when the system was last rebooted, this endp oint will
cause audio echo throug hout the conference. First, isolate the offending
endpoint by asking each endpoint to mute, one at a time , until the echo
disappears.