Avaya MCC1 Maintenance Procedures page 203

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, these faults are caused by the server 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 every audio
connection to a different VC port.
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 S8700 Media
Server MMCH to be idle (no active conferences), and then check the circuit packs for active
(amber) 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 two types. The first occurs when the 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 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.
Check this on page 1 of the Status Conference x Endpoint y Vid screen 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 screen for indication of the video state for
the endpoint values.
Calls terminate correctly but are unstable
A number of conditions will lead to some or all endpoints having stability problems during the course of
a conference. A lack of stability from an endpoint is noticeable by a lack of a video switching while the
party is the only talker or excessive disconnects from that endpoint.
Maintenance Procedures
December 2003
Troubleshooting Multimedia Call Handling (MMCH)
Troubleshooting
203