Mitel 50005070 Instruction Manual download pdf (Page 301)

291

Advanced Troubleshooting and Repair

Broken Audio,

intermittent (IP trunks

only)

Handsfree on the far

end.

Ensure that neither device is using

Handsfree. Some handsfree phones

only operate at half duplex.

Packet loss, jitter via

network.

1. Identify the speech path between

the two end points, including

router, switch WAN in the audio

stream.

2. The network administrator needs

to apply QOS/TOS to minimize

jitter over slow speed interface

(T1, Frame Relay, etc.), and give

voice traffic priority over data.

Limited bandwidth and

too many calls across

router, or combination

data and voice.

1. Limit the number of calls to remote

subnets.

2. The network administrator needs

to apply QOS/TOS to give voice

traffic priority over data.

Physical port error

(CRC, faulty cable,

duplex mismatch, HUB).

1. Identify the speech path between

the two end points, including

router, switch WAN in the audio

stream.

2. Verify that there is no duplex

mismatch in each port settings

and/or faulty cable, or faulty port.

3. Make sure that the IP Phone is not

plugged into a HUB.

Compression enabled Compression will save bandwidth,

but may cause noticeable clipping. If

not sure, disable compression to see

if it makes a difference.

Router’s CPU is

exhausted or congested.

Router may be running excessive

filtering. The network administrator

may need to monitor the

performance of the router.

Echo between IP

Phones

Layer 2 switch setting

problem.

1. Check the L2 switch for duplex

mismatch and spanning tree.

2. Turn off if possible.

Table 60: Audio Quality Problems Troubleshooting (continued)

Symptoms Probable Cause Corrective Action

(Page 2 of 2)

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