Troubleshooting guide

Hardware
59
Issues with Specific Models
IP Phones
(Dual Mode)
Dual Mode phone fails to
boot up.
Dual mode phones may fail
to boot up for two different
reasons:
1. Cisco Discovery Protocol
(CDP) is not supported in
certain loads.
2. You cannot downgrade
the Boot Loads in dual
mode sets and they are
not compatible with the
Main Load in 5.0.5.5.
Refer to Mitel Knowledge Base
article 04-5173-00019.
Dual Mode phone does
not retain the increased
volume after user hangs
up.
Dual mode sets reset to the
default volume of level 4 if a
user changes the volume to
the maximum level of set and
then hangs up.
Refer to Mitel Knowledge Base
article 06-5173-00037.
Table 16: Specific Model Troubleshooting
Phone Symptom Probable Cause Corrective Action
5560 IPT Only the left handset is
functioning. The right
handset is not operational.
Directory number is not
assigned to the 5560 IPT
Slave.
In the 5560 IPT Master/Slave
Association form, assign a Slave
directory number.
5235, 5320,
5330, 5340,
5360 IP
Phone
A 5235 IP set loses all
application features
(including People,
Messages, History,
Settings and Applications)
and Labels after the set is
rebooted.
OR
A 5235, 5320, 5330, 5340 or
5360 set loses all
applications after the 3300
ICP IP address is
changed.
The controller address
does not match the
ICP/PBX assignment.
1. Program Network IP address in
the ICP/PBX Networking form to
match IP address of the local
controller.
2. Reboot the controller to make
the change effective.
SUPERSET
4000, YA, and
IP Phones
Headset issues. Attempting to use an
unsupported headset.
Refer to Mitel Knowledge Base
article 05-6778-00015 for a listing
of supported headsets.
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Table 15: General Phone Troubleshooting
Phone Symptom Probable Cause Corrective Action
Page 7 of 7