Mitel MiVoice Business Voice Quality And Troubleshooting Manual page 52

Voice Quality Troubleshooting Guide
THE ISSUE IS
OCCURRING ON . . .
Calls involving IP Packet loss or bit errors occurring due
to incorrect Quality of Service settings
phones on a specific
on MiVoice Business platform, layer 2
MiVoice Business
switch, layer 3 switch, or router.
platform, layer 2
switch, layer 3 switch,
or router.
Calls involving IP Packet loss occurring due to contention
between the devices on the hub.
phones that are
connected to a hub.
On multiple IP and Electrical interference caused by
routing the Ethernet cables or phone
analog phones in a
lines close to power cables (for
common location
example, routing cables horizontally in
within a building (for
the same cable channel or vertically
example, a specific
together in an elevator shaft).
floor or area).
On multiple phones Low volume hissing is typically channel
noise caused by signal energy (white
across network.
noise).
All calls involving a Ethernet cable that connects the IP
Phone to the MiVoice Business
single IP phone
controller or layer 2 switch is routed in
close proximity to power conductors.
Electrical interference from power cable
is resulting in a voice quality issue.
Ethernet cable that connects the phone
to the network connector is too long.
IP or TDM calls over Faulty cabling or faulty programming.
PRI links.
46
Table 13: Cracking, Clicking, Popping, or Static
PROBABLE CAUSE CORRECTIVE ACTION
Ensure Quality of Service settings are
correct on all network components (MiVoice
Business platforms, layer 2 switches, layer 3
switches, routers, and VLANs). Refer to the
MiVoice Business Engineering Guidelines
for QoS guidelines.
MiVoice IP Phones are not supported on
hubs. Replace hub with layer 2 or layer 3
switch.
Route power cables separately from phone
lines and Ethernet cables. Refer to the
MiVoice Business Hardware Technical
Manual for Ethernet cabling guidelines.
None. All calls have some idle channel
noise.
Route Ethernet cables separately, away
from any power cables. Refer to the MiVoice
Business Hardware Technical Manual for
Ethernet cabling guidelines.
Ensure that the cables used for IP phone
connections are a maximum of 1.5 m (5 ft) in
length. Refer to the MiVoice Business
Hardware Technical Manual for Ethernet
cabling guidelines.
Refer to "Digital Trunk Troubleshooting" in
the MiVoice Business Troubleshooting
Guide.
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