Audio Problems; No Speech Path; Choppy Speech; General Telephone Call Problems - Cisco 7800 Series Administration Manual

Cisco IP Phone Troubleshooting

Audio Problems

The following sections describe how to resolve audio problems.

No Speech Path

Problem
One or more people on a call do not hear any audio.
Solution
When at least one person in a call does not receive audio, IP connectivity between phones is not established.
Check the configuration of routers and switches to ensure that IP connectivity is properly configured.

Choppy Speech

Problem
A user complains of choppy speech on a call.
Cause
There may be a mismatch in the jitter configuration.
Solution
Check the AvgJtr and the MaxJtr statistics. A large variance between these statistics might indicate a problem
with jitter on the network or periodic high rates of network activity.

General Telephone Call Problems

The following sections help troubleshoot general telephone call problems.

Phone Call Cannot Be Established

Problem
A user complains about not being able to make a call.
Cause
The phone does not have a DHCP IP address. The phones display the message Configuring IP or
Registering.
Cisco IP Phone 7800 Series Multiplatform Phones Administration Guide
Audio Problems
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