Cisco 7962G - Unified IP Phone VoIP Probleemoplossing en onderhoud - Pagina 18

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Cisco 7962G - Unified IP Phone VoIP Probleemoplossing en onderhoud

General Troubleshooting Information

Summary

Codec mismatch between the phone and another

device

Sound sample mismatch between the phone and

another device

Gaps in voice calls

Loopback condition

Troubleshooting and Maintenance

Explanation

The RxType and the TxType statistics show the codec

that is being used for a conversation between this

Cisco Unified IP phone and the other device. The

values of these statistics should match. If they do not,

verify that the other device can handle the codec

conversation, or that a transcoder is in place to handle

the service.

See

Call Statistics Screen

for information about

displaying these statistics.

The RxSize and the TxSize statistics show the size of

the voice packets that are being used in a conversation

between this Cisco Unified IP phone and the other

device. The values of these statistics should match.

See

Call Statistics Screen

for information about

displaying these statistics.

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.

See

Call Statistics Screen

for information about

displaying these statistics.

A loopback condition can occur when the following

conditions are met:

• The SW Port Configuration option in the

Network Configuration menu on the phone is set

to 10 Half (10-BaseT / half duplex)

• The phone receives power from an external

power supply

• The phone is powered down or the power supply

is disconnected

In this case, the switch port on the phone can become

disabled and the following message appears in the

switch console log:

HALF_DUX_COLLISION_EXCEED_THRESHOLD

To resolve this problem, re-enable the port from the

switch.