Mitel 50005070 Instruction Manual download pdf (Page 300)

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SX-200 ICP MX Technician’s Handbook

Table 60: Audio Quality Problems Troubleshooting

Symptoms Probable Cause Corrective Action

Excessive noise Faulty cabling Check for cabling problems.

One way audio

between Remote IP to

TDM (VM)

No gateway IP address

programmed in the

controller.

Make sure that the gateway IP

address is programmed properly.

Distorted audio only

on NSU

Voice encoding is not

inverted.

1. For T1, enable invert for Voice

encoding in link descriptor.

2. For CEPT or API, enable ADI

invert for voice encoding. (This

does not apply to Embedded PRI.)

Echo Echo between LS trunks

and IP phones.

Measure the loss level and

impedance for LS trunks connected

to onboard ASUs (See “Diagnostic

Function Commands” on page 228).

If necessary, update the Options

subform of Form 13 with matching

settings.

Handsfree mode is used. Check if far end is using handsfree.

Switch to Handset mode to see if this

corrects it, or lower the handsfree’s

volume.

Echo Canceller is

beyond specifications.

1. Identify the path between the two

end points, and verify if Trunk is

always involved.

2. Check with Telco to see if the trunk

is within specs. On a typical T1,

the input signal should be -15 dB.

If it is too high (-5 dB for example),

echo may result.

3. If this is the case, keep an echo log

to isolate the problem.

Network jitter issue. If the problem only occurs between

IP devices, check network jitter issue

below.

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