Avaya MCC1 Maintenance Procedures page 202

Troubleshooting
Troubleshooting Multimedia Call Handling (MMCH)
64-kbps calls terminate, but far end receives
56-kbps indication
Description
Some 2 x 64-kbps conferences on the S8700 Media Server MMCH are not established because of
framing, audio, or video problems.
For calls that are routed in the network through an Avaya/LEC interface, the originating equipment may
launch a 64-kbps call attempt, and the far end receives either a 56- 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 (least likely, since one endpoint must realize that the call is using
56-kbps facilities)
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 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 conference parties.
Solution
1 Use the Status Conference x screen 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" field on page 3 of the Status Conference x Endpoint y screen.
Check the Audio fields under the Mode Commands/Communication Modes section of the
screen.
202 Maintenance Procedures
December 2003