Cisco Systems ATA187I1ARF manual Troubleshooting and Maintenance General Troubleshooting Tips

Models: ATA187I1ARF

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Chapter 6 Troubleshooting and Maintenance

General Troubleshooting Tips

Table 6-2

ATA 187 Troubleshooting (continued)

 

 

 

 

 

Summary

 

Explanation

 

 

 

 

Prolonged broadcast storms

A prolonged Layer 2 broadcast storm (lasting several minutes) on

 

cause phones to reset, or be

the voice VLAN may cause phones to reset, lose an active call, or

 

unable to make or answer a call

be unable to initiate or answer a call. Phones may not come up until

 

 

 

a broadcast storm ends.

 

 

 

 

Moving a network connection

If you are powering your phone through the network connection,

 

from the phone to a workstation

you must be careful if you decide to unplug the phone’s network

 

 

 

connection and plug the cable into a desktop computer.

 

 

 

 

 

 

 

 

 

 

Caution The computer’s network card cannot receive power

 

 

 

 

 

 

through the network connection; if power comes through

 

 

 

 

 

 

the connection, the network card can be destroyed. To

 

 

 

 

 

 

protect a network card, wait 10 seconds or longer after

 

 

 

 

 

 

unplugging the cable from the phone before plugging it

 

 

 

 

 

 

into a computer. This delay gives the switch enough time

 

 

 

 

 

 

to recognize that there is no longer a phone on the line

 

 

 

 

 

 

and to stop providing power to the cable.

 

 

 

 

 

 

 

 

Changing the phone

By default, the network configuration options are locked to prevent

 

configuration

 

users from making changes that could impact their network

 

 

 

connectivity. You must unlock the network configuration options

 

 

 

before you can configure them.

 

 

 

 

Dual-Tone Multi-Frequency

When you are on a call that requires keypad input, if you press the

 

(DTMF) delay

 

keys too quickly, some of them might not be recognized.

 

 

 

 

Codec mismatch between the

The RxType and the TxType statistics show the codec that is being

 

phone and another device

used for a conversation between this ATA 187 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.

 

 

 

 

Sound sample mismatch

The RxSize and the TxSize statistics show the size of the voice

 

between the phone and another

packets that are being used in a conversation between this ATA 187

 

device

 

and the other device. The values of these statistics should match.

 

 

 

 

Gaps in voice calls

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.

 

 

 

 

 

 

 

 

Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.0

6-8

OL-21035-01

 

 

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Cisco Systems ATA187I1ARF manual Troubleshooting and Maintenance General Troubleshooting Tips