TD 92685EN
28 June 2012 / Ver. A
Troubleshooting Guide
Ascom i62 VoWiFi Handset
55
7. VoWiFi Handset
7.1.7 Connected Call but No Sound or One-way Sound
Check for an IP address conflict by pe
rforming the following steps
1 For each handset, obtain the IP address using the h
andset Device info > Network info
menu described in Appendix B.1
2 Write down the IP-address of each handset.
3 Turn off the handsets.
4 Ping each handset IP address noted in step 2.
5 Did the ping return a result for one or
both of the pinged IP addresses?
Yes: The prob
lem is an IP-address conflict.
No: Go to st
ep 6.
6 Enable logging in the handset Admi
n menu as described in Appendix D.2.1. Check
that ARP requests from the handset are answered by the system and that RTP data is
bi-direction
al.
7.2 U-APSD Troubleshooting
This section describes how to verify that U-APSD is set-up and configured correctly. U-APSD
is normally present and does not need to be specially enabled. However, some WLAN
infrastructures may need to tune the parameters associated with U-APSD. For additional
information, refer to the infrastructure configuration notes for the equipment manufactured
by a particular product partner.
The screenshots used in this section are captured f
rom the OmniPeek protocol analyzer.
Various APs are used in the following examples since all
APs supporting this functionality
use the same information element codings.
7.2.1 Determining if the AP Supports U-APSD
A handset will not be able to use U-APSD if the AP does not s
upport U-APSD. U-APSD
support is indicated in the QoS information element.
To locate the QoS element, select
the 802.11 Beacon from the Protocol column shown in the
Capture > Packets summary table in figure 17. Detail information for the selected beacon is
displayed in the text area under the summary table. The WMM tag of interest is present in
beac
ons and probe responses and is shown in the WMM parameter element. In the example
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