Troubleshooting guide

Troubleshooting Guide
78
Echo occurring
between IP
Phones and
TDM Phones
Handsfree mode is
used.
Check if far end is using handsfree. Switch to handset mode to see
if this corrects it, or lower the volume in handsfree mode.
If echo occurs on calls
between IP and TDM
phones, the Echo
Canceller could be
beyond required
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.
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 above.
Loop Start (LS) Trunk
settings
If the problem occurs on phones that are connected via Loop Start
(LS) trunks, use the Line Quality Measurement form in the System
Administration Tool to test the line quality and to obtain the
recommended settings.
Table 20: Audio Quality Troubleshooting(continued)
Symptom Prossible Cause Corrective Action
Page 3 of 4