Avaya manual described in Viewing the Network Audio Quality, in 4620/4620SW/4621SW IP, 3 of

Telephone Management and Troubleshooting

Problem/Symptom	Suggested Solution (continued)
Audio quality is poor,	Various potential network problems might be
specifically, you hear an echo	causing the problem.
while using a handset, static,	Access the Network Audio Quality screen
sudden silences (gaps in	(described in Viewing the Network Audio Quality
speech), clipped or garbled	in Chapter 6: 4620/4620SW/4621SW IP
speech, etc.	Telephone Options) to provide your System
	Administrator with specific information related to
	this problem.
	Contact your LAN Administrator with as
	complete a description of the problem as
	possible.

No dial tone

A feature does not work as indicated in this guide (for example, the Redial button does not operate as described)

Check that both the handset and line cords into the phone are securely connected. Note that there might be a slight operational delay if you unplug and reconnect the phone.

Reset or power cycle the phone with your System Administrator’s assistance. (See the section titled Resetting and Power Cycling the IP Telephone for details.)

Contact your System Administrator if these steps do not produce the desired result.

Verify the procedure and retry. For certain features, you must lift the handset first or place the phone off-hook.

Contact your System Administrator if this action does not produce the desired result. Your telephone system might have been specially programmed for certain features applicable only to your installation.

All other IP Phone problems Contact your System Administrator.

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82 4620/4620SW/4621SW IP Telephone User Guide