Avaya S8700 Maintenance Manual page 136

For multi-connect configurations

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Alarms, Errors, and Troubleshooting

64-kbps Calls Terminate, but Far End Receives

56-kbps Indication

Some 2 x 64-kbps conferences on the S8700 Multi-Connect 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.

Administer the conference for connection at 56 kbps.

Calls Terminate with No Audio

To support endpoints that do not support Multipoint Command Conference (MCC),

the S8700 Multi-Connect 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.

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.

Issue 1 May 2002

Troubleshooting