TD 92685EN
28 June 2012 / Ver. A
Troubleshooting Guide
Ascom i62 VoWiFi Handset
31
4. Factors Affecting RF
responsible for managing and administering the network. Do not make unauthorized
modifications.
Note: D
o not change any security settings that will jeopardize the WLAN.
4.3 Isolate Problem Areas
An understanding of the above model can help in the troubleshooting process. A support
engineer may use the model and ask questions and gather facts which relate to one of the
protocol layers and thereby identify a single device, location or application that might be
causing the problem.
In a top-down approach questions, like in the following exam
ple, can help the support
engineer focus attention on a particular area. Start with testing the functionality of the
applications and eliminate application configuration errors first:
Problem: A user cannot make a phone call.
Question Layer tested Result
Is more than one handset affected? 1-4 Yes: The
problem may be on Level
2-4 but is probably caused by a
malfunctioning PBX or Unite
module.
No: The problem is to be found in
the single devi
ce.
Can a laptop reach the PBX or Unite
t
hrough the WLAN by browsing or
using ping?
1-3 Yes: This eliminates wrong
configuration of the WLAN L2-L3.
Combined with the question above
it will remove L
2 and L3 problems.
No: Check WLAN settings in t
he
system and handset.
Is both VoIP and Unite traffic
affected or int
errupted?
1-4 Yes: Check WLAN/LAN settings
since something seems to block
communication between the
handset and PBX or Unite.
No: This pro
bably eliminates AP and
LAN problems.
Is it possible to ping to the handset? 1-3 Yes: Th
e problem is likely to be
found in misconfigured parameters
for VoIP or Unite in the handset or in
the PBX or server platforms.
No: Check
WLAN/LAN settings since
something seems to block
communication between the
handset and the PC.
Is it possible to ping from the
ha
ndset?
1-3 Yes: The problem is likely to be
found in misconfigured parameters
for VoIP or Unite in the handset or in
the PBX or server platforms.
No: Check
WLAN/LAN settings since
something seems to block
communication between the PC and
the handset
Voice quality is unsatisfactory but
call
s still go through?
1-4 Yes: RF problem, QoS problem or
misconfigured handsets.
No: OK
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