Troubleshooting Page 135 of 206
WLAN IP Telephony Installation and Configuration
There may also be incorrect programming of the APs. Refer to Appendix B:
“Compatible Access Points” on page 197 for compatibility and configuration
information about the APs in use at the site.
Duplex mismatch
A duplex mismatch on the WLAN can cause the wireless handsets to not
operate properly. Double-check WLAN connections and interfaces to ensure
that they are all configured as full-duplex.
No ring
It is possible in certain situations for a voice mail message to be left on a
wireless handset without the wireless handset ever ringing. This situation
could occur when a wireless handset is out of range of an AP for even a few
seconds. If during the time the wireless handset were out of AP range and an
incoming call was received, the incoming call receives the Call Forward No
Answer (CFNA) treatment configured for that wireless handset, such as
forwarding the incoming call to voice mail.
To prevent this situation from occurring, ensure adequate AP coverage in all
areas where a wireless handset might be used.
Dropped calls
If calls are dropping, use the Site Survey mode of the wireless handset in the
area where the problem occurred to determine if there is inadequate AP
coverage in that area.
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