Quality Of Service (Qos) Test - ASCOM i62 Troubleshooting Manual

Troubleshooting Guide
Ascom i62 VoWiFi Handset
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 Time to Live (TTL) can be used to 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 devices 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 the 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 possible 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
2 Make a call from the handset.
3 On the left of the Troubleshooting panel, locate and select Syslog. 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. Check 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: The 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 that all voice data is sent in the voice queue perform an air trace such as
that described in
Note: The handset 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.
28 June 2012 / Ver. A
5. The VoWiFi Handset as
5.4 Handset Web Interface
Appendix A.
on page 36.
TD 92685EN
39