Programming instructions

222
3300 ICP Technician’s Handbook
Phone Audio Quality
If you can’t fix the problem using Table 29, call Mitel Technical Support
(see “Before You Contact Technical Support” on page 179).
Make sure you have the following information on hand before calling:
 Setup scenario
 Is there a common denominator (router, only one side of subnet, etc.)
 Other call scenarios (IP to IP, IP to TDM, etc.)
 Layer 2 switch configuration and settings
 Router configuration and settings
 Network diagram
 IP addressing scheme
 VLAN configuration and settings
 Layer 2 switch port statistics for FCS, collision and duplex mismatch.
Tip: Use the debug option on display IP phones to view Version, Network,
Telephony/DSP, Connection Browser Config, memory Stats details (see
page 170).
Table 29: Audio Quality Problems Troubleshooting
Symptoms
Probable
cause
Corrective Action
One-way audio
between
Remote IP to
TDM (VM)
No gateway IP
address
programmed on
E2T.
1. If E2T gets IP address from DHCP
server, make sure that Option 03
(Router) is assigned to the scope with
the proper IP address for the subnet.
2. If E2T is hardcoded with a static IP
address, make sure that the gateway IP
address is programmed properly in
VxWorks.
Distorted audio
only on NSU
Voice encoding
is not inverted.
For T1, enable invert for Voice encoding
in link descriptor. For CEPT or API, enable
ADI invert for voice encoding. (This does
not apply to Embedded PRI.)
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