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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Routine Maintenance Procedures
Page 5-63Troubleshooting Multimedia Call Handling (MMCH)
5
network to test the connectivity and routing of network calls from the endpoint.
This eliminates problems such as disconnected audio or video cables and
network troubles.
64 Kbps Calls Terminate but Far End Receives
56 Kbps Indication
Description
Some 2x64 Kbps conferences on the DEFINITY MMCH do not establish because
of framing, audio, or video problems.
For calls that are routed in the network through a Lucent Technologies/LEC
interface, the originating equipment may launch a 64 Kbps call attempt, and the
far end receives either a 56 Kbps or 64 Kbps indication. If the far end receives a
64 Kbps indication, the call may have used 56 Kbps facilities. If so, the call may
exhibit any of the following conditions:
■ No handshaking in one direction or both (call disconnects after timeouts)
■ Call connects, but audio or video is corrupted (audio noise or no video)
■ Call succeeds without disruption (this is the least likely since one endpoint
must be aware that the call is really 56 Kbps to connect)
If any of the above conditions occur, then 64 Kbps calls from the site are
blocked.
Solution
Administer the conference for connection at 56 Kbps.
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.