Lucent Technologies Release 7 Calls Terminate with No Audio, Some Parties Cannot Be Heard by Others (Audio Subsetting)

DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4 June 1999
Alarms, Errors, and Troubleshooting
5-61Multimedia Call Handling (MMCH)
5
Calls Terminate with No Audio
Description
To support endpoints that do not sup port Multipoint Command Conference
(MCC), the DEFINITY MMCH changes its capability set and initiat es a capability
set exchange with the endp oint when the Selected Communications Mod e (SCM)
changes. If the endp oint does not follow the SCM audio mode, the MCU may
include the endp oint as a secondary (audio only) end point. If the endpoint send s
an unknown or unsupported audio mode, then the TN788B decod er port mutes
the endpoint from the conferenc e. The user may hear the conference but may not
be heard by other p arties in the conference.
Solution
1. Use the Status Conference x form and chec k the Audio Mode field for the
current operating mod e of the conference.
2. Another indication of the aud io modes is in the “Incoming Mode
Commands from Endpoint and Outg oing Commands from MMI” on p age
3 of the Status Conference x Endpoint y form. Chec k the Audio fields
under the Mode Commands/Com munication Modes section of the form.
Some Parties Cannot Be Heard by Others (Audio
Subsetting)
Description
Problems where varying subsets of the c onference 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 u p the connections
properly. Isolation and diagn osis 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 board s in use, which
refreshes the VC translations and move all of the audio c onnections to
different VC ports.
2. If the problem still exists, try dropping the conference and then bringing
the conference bac k up again. Not only does this refresh VC translations,
but uses different timeslots as well.
3. If the problem still exists, susp ect a hardware problem. If pr actical, wait for
the DEFINITY MMCH to be idle (no active conferences), and then check
the circuit pac ks for active (yellow) LEDs. If any of these are unexpected ,
such as on a VC board, try rep lacing the board and then bringing the
conference up aga in.