TD 92685EN
28 June 2012 / Ver. A
Troubleshooting Guide
Ascom i62 VoWiFi Handset
39
5. The VoWiFi Handset as
Request timed out
The following output indicates that the device is
taking an unusually long time to be
reached:
Reply from ::ffff:10.30.32.166: bytes=32 time=2738ms TTL=127
Note: The Tim
e to Live (TTL) can be used t
o determine approximately how many router
hops the packet has gone through. If the TTL field varies in successive pings, it could indicate
that the successive reply packets are going via different routes, which is not desirable.
Traceroute
The traceroute utility is a network diagnostic tool for displaying the route and measuring
transit delays of packets between two devic
e
s across an IP network. One device is usually a
handset making a call and the other device is the device to be reached, such as a handset or
a PBX or Unite server.
To run traceroute, select Traceroute from th
e Tools pane and enter the IP address of the
device to be reached from the calling device. The result of the traceroute looks like this
Figure 14. Traceroute Result
5.4.4 Quality of Service (QoS) Test
It is important to perform a QoS test on all possibl
e call scenarios such as calls between
handsets on the same APs or controller, on different APs or controller, between handsets
and fixed phones, and internal to external phones. QoS tests can be performed using
handset web interface in the following way:
1 Login to the web interface and open the Troubleshoot pane
as described in the
section 5.4 Handset Web Interface on pa
ge 36.
2 Make a call from the handset.
3 On the left of the Troubleshooting panel, locate and select Syslo
g. A dump of the
syslog is displayed.
4 Locate the row in the log with an entry of Voice Rx. Check that the
handset has
received voice data in the voice queue (UP 6) by verifying that the Syslog entry is as
follows:
Voice Rx IP DSCP: 0x2e UP: 6
5 Locate the row in the log with an entry of Voice Tx.
Che
ck that the handset has sent
voice data in the voice queue (UP 6) by verifying that the Syslog entry is as follows:
Voice Tx IP DSCP: 0x2e UP: 6
Note: Th
e DSCP channel value is set in handset parameter IP DSCP
for voice and
should be set to match the LAN/WLAN configuration. The handset parameter is
displayed from the PDM Edit parameters > Network > Active network.
Note: The UP value displayed in Syslog is from the first voice package at
call startup.
To ensure t
hat all voice data is sent in the voice queue perform an air trace such as
that described in Appendix A.
Note: The hands
e
t always sends voice data in the voice queue (UP 6) unless CAC/
TSpec settings in the WLAN system prevent it from doing so. Traffic Specification
(TSpec) lets a 802.11 client signal its traffic requirements to an AP.
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