Avaya Definity SI Maintenance Manual page 156

Routine Maintenance Procedures
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 Avaya/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.
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.
5-52 Issue 4 May 2002 555-233-123