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Multimedia Call Handling (MMCH)
Issue 4 May 2002 5-53 555-233-123
Some Parties Cannot Be Heard by Others (Audio
Subsetting)
Description
Problems where varying subsets of the conference hear different things may have
problems with the various summing resources/groups that are in use. Traditionally
theses faults are caused by the SPE not cleaning up the connections properly.
Isolation and diagnosis should focus on the VC resources in use by that
conference.
Solution
1. Use the status conference command to list the VC resources in use by
this conference. Try a hot replacement of any VC boards in use, which
refreshes the VC translations and move all of the audio connections to
different VC ports.
2. If the problem still exists, try dropping the conference and then bringing the
conference back up again. Not only does this refresh VC translations, but
uses different timeslots as well.
3. If the problem still exists, suspect a hardware problem. If practical, wait for
the DEFINITY MMCH to be idle (no active conferences), and then check
the circuit packs for active (yellow) LEDs. If any of these are unexpected,
such as on a VC board, try replacing the board and then bringing the
conference up again.
Calls Terminate with No Video
Description
Generally, loss of video can be divided into 2 types. The first occurs when the
DEFINITY MMCH switches to the endpoint, but nobody sees them. The receivers
see either “black” video or a frozen image of the previous speaker depending on
the codec of the manufacturer. The type occurs when the DEFINITY MMCH does
not switch to an endpoint.
Solution
In the first type described above, wiring problems, power to the camera, or video
encoder circuit pack problems in the codec are typical causes.
In the second type, no video from an endpoint typically occurs because it is not a
valid video source. This can be checked by looking at page 1 of the Status
Conference x Endpoint y Vid form under the Capability section. In this section, a
“y” or “c” suggests that the endpoint has video. An “e” means ept has not declared
any video capability in cap set, “n” is audio only, and “blank” means audio add-on.
Also check page 1 of the Status Conference x Endpoint y Vs form for indication of
the video state for the endpoint values.