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DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance for csi systems
1-136Troubleshooting Multimedia Call Handling (MMCH)
1
Calls Terminate with No Audio
Description
To support endpoints that do not support Multipoint Command Conference
(MCC), the DEFINITY MMCH changes its capability set and initiates a capability
set exchange with the endpoint when the Selected Communications Mode (SCM)
changes. If the endpoint does not follow the SCM audio mode, the MCU may
include the endpoint as a secondary (audio only) endpoint. If the endpoint sends
an unknown or unsupported audio mode, then the TN788B decoder port mutes
the endpoint from the conference. The user may hear the conference but may not
be heard by other parties in the conference.
Solution
1. Use the Status Conference x form and check the Audio Mode field for the
current operating mode of the conference.
2. Another indication of the audio modes is in the “Incoming Mode
Commands from Endpoint and Outgoing Commands from MMI” on page
3 of the Status Conference x Endpoint y form. Check the
Audio
fields
under the Mode Commands/Communication Modes section of the form.
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.