Troubleshooting Scenarios
TROUBLESHOOTING GUIDE
Ascom Myco 3
− No: Go to the section Roaming, page 44.
Roaming
Check if audio problems are present while moving through the site in a call mode:
1. Make a call to another party and move through the site while holding a conversation with the other
party.
2. During a call, with the Site survey screen activated, monitor the RSSI value and see if the audio
problem is experienced during the handset roam.
− Analyze the results.
3. Are audio problems experienced?
− Yes: Investigate possible problems caused by incorrect QoS setting, external interference and
security issues.
QoS
Control QoS in a network analyzer tool to confirm that both Rx and Tx have UP 6, if not QoS needs to be
corrected in the LAN/WLAN. For more information on QoS, refer to the chapter 3.1 Quality of Service (QoS)
Recommendations in Ascom VoWiFi System, System planning, TD 93358EN.
External Interference
External interference may occur when VoWiFi devices are forced to share the RF spectrum with other
devices. Such devices often create interference for wireless LAN users. Perform a site survey with a
spectrum analyzer to identify sources of interference.
Security
If Extensible Authentication Protocol (EAP) security is used, check if the full EAP exchange is performed
during the roam with an air trace or log of the Radius server. Normally the keycaching function in the WLAN
system and handset prevent a full EAP exchange during roam.
6.3 Warning Messages
This section illustrates the most common fault messages for the Ascom Phone (VoIP) app that can be
rectified using corresponding troubleshooting tools. Such warning messages contain detailed information
about specific errors including guidance on further actions to resolve the existing problems.
6.3.1 No Network Connection
Network connection lost message indicates that there is some fault in a layer below an application. If there
is no access to the Wi-Fi, there is no Access Point (AP) to associate with, which may be caused by the
handset being out of range or by incorrectly configured Wi-Fi network parameters.
44
TD 93297EN / 19 December 2019 / Ver. B
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