TD 92685EN
28 June 2012 / Ver. A
Troubleshooting Guide
Ascom i62 VoWiFi Handset
54
7. VoWiFi Handset
Voice Only
A “Voice only” message indicates that the handset is configured to use both a PBX a
nd an
Unite Messaging gateway (like IMS3) but has lost contact with the Messaging gateway.
1 Perform the checks described in the section Test for Unite Access on
page 53.
Note: When a handset is placed
in the programming cradle that is connected to a PC
running PDM will it display “Voice only” and not receive SMSs.
2 If the Messaging function is not used in th
e system, verify that the IP-address to
Unite is set to the default value of “0.0.0.0”.
7.1.5 No Channel
A “No channel available” message indicates one or more of the following situations:
• The handset did not receive the expected answer from th
e PBX during call setup.
• The user attempts to make a call when the handset is displaying “Messaging only”.
7.1.6 Battery Power is Low
If the battery level drops significantly faster than expected, two major causes are tha
t the
battery is old and discharges rapidly or the handset is using its radio too often when not
making calls. Even when not making a call the handset needs to use its radio to perform
background tasks such listening for incoming calls, for performing scans at cell boundaries
and for collecting information for location services.
If the handset is unable to leave active status when pe
rforming background tasks, the
battery drains fast. The same problem arises if U-APSD has not been setup correctly and the
power save mode is not working correctly.
To investigate battery problems, perform t
he following checks:
1 Use a different battery to check if the pro
blem reoccurs on one or more phones. <If
the problem reoccurs, check that the correct chargers are being used.
2 Check the production date of the battery and replace with a new one if necessary.
The ba
ttery has a minimum 80% capacity left after 400 charging cycles at 20±5°C.
3Check Beacon interva
l and DTIM periods in the AP using the handset Device info >
WLAN info menu described in Appendix B.1. These values should be set to the
recommended value for the infrastructure according to Interoperabili
ty
documentation. For additional information, see Figure 3. Handset Operating in U-
APSD PS Mode on
page 17.
Note: Th
e settings are done in the WLAN infrastructure and not in the handset.
Incorrect settings will reduce battery time on all handsets in the cell.
4 If the system is setup to use U-APSD for voice calls, check the voice power save mode
pa
rameter in the PDM. Pay special attention to the QoS settings and ensure that
these are set correctly.
5 Use a protocol analyzer on both the wired and wireless side, and check the amount of
broadcast traffic that is transmitted
over the WLAN.
Broadcasts created in the LAN normally are conve
yed over the WLAN as broadcast or
multiple unicast packets. A WLAN administrator may block this translation. Note that
broadcasts are sent at the lowest mandatory speed, and if changed to unicast, may
create copies for each client.
One example of a protocol that uses broadcasts is th
e ARP protocol. Blocking ARPs to
handsets can normally be set in the AP, that will act as an ARP proxy on behalf of the
handset, and send the ARP reply instead.
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