Cadence Flash F200-2 Guia de Resolução de Problemas descarregar pdf (Página 56)

56 Troubleshooting

Ask the following questions:

•

What units are involved in the call (for example, IP Phone, TDM

telephone, trunk, or PSTN)?

•

Does the echo occur on the handset, the headset, or the speaker?

• If the call is transferred to a digital telephone, does the echo still

appear? How frequently among the calls made does the echo happen?

At what point in the call does the echo happen? What type of trunks

does the site have (assuming echo happens on trunk calls)? If multiple

types of trunks exist, does the echo occur on all types or only some?

• Does the echo happen for all users or only some? Do commonalities

exist between those users (for example, all speak loudly, or all on

same subnet)?

•

What happens to the echo when the receiver (far end non-IP Phone)

of the call unplugs the handset?

• What kind of telephone is involved at the far end?

•

Does the echo occur only on calls originated by the IP Phone user or

calls received by the IP Phone user?

•

When the echo occurs, what is the end caller’s phone type (for

example, an analog or a digital telephone)?

•

Is the echo occurring on local, internal, long distance, or all calls types?

•

What is the effect of turning off the sidetone on the IP Phone?

Echo is typically not reported on IP Phone to IP Phone calls. Experience

indicates echo usually occurs for calls though the gateway. One indication

that the DSP echo canceller is not working optimally is if the divergence

count is high (printed at the end of the call when DimECStat is configured

or by the tsm_stat_req_ecd/jointfilesconvert/306392/bg command). This typically is 15 or less on

calls where the echo canceller locks on the echo.

If the echo occurs only as a short burst at the beginning of the call, this

is caused by the DSP echo canceller converging on the echo, a normal

function. This process typically takes a couple of seconds. It is usually

not annoying enough to report, but may be reported with a more severe

symptom.

Second, if the echo is occurs only on trunk calls, determine with a non-IP

Phone (for example, a 3904 digital telephone) if the same calls have

echo. The echo may be caused by trunking, CO, or long-distance carrier

problems. If the problem occurs mainly with long distance calls, make

a call using a calling card for a different carrier and see if the problem

occurs. Analog trunks can cause a complex echo that the DSP echo

canceller has difficulty converging on.

Nortel Communication Server 1000

Troubleshooting Guide for Distributors

NN43001-730 02.02 31 December 2009

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