Programming instructions

223
Troubleshooting
Broken Audio,
intermittent
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, or faulty cable, or
faulty port.
3. Make sure that the IP Phone is not
plugged into a HUB.
Compression
zone 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.
Table 29: Audio Quality Problems Troubleshooting (continued)
Symptoms
Probable
cause
Corrective Action
(Page 2 of 3)