I have a problem with the connection/quality of speech when standing within 2-3 meters away of an AP with a 7920 phone. Also The connection to the CM is broken sometimes. (Also during a call) after the call drops the phone will connect to the CM automatically.
Phone software : 7920.3.3-01-06
Call manager : 3.3.3
AP : Cisco 1230 + 4941 'duck' antenna's
128 WEP is used, vlans are used no fancy stuff....
Also the quality of speech in not great...Hick-up's occure, calls drop sometimes.
the sitesurvey is OK. No overlapping channels (1,6,11) the RSSI is alway's above 20 , QBSS (CU) is also fine.
Does anyone have similar issue's. With this software
A couple of things we have discovered:
The phone likes choses. It may not roam well with just one AP as a chose, but will roam well if it has 2 to choose from.
Having RSSI levels above 20 just doesn't cut it when roaming. Develop roaming areas to allow the phone to have a couple of APs to choose from with RSSI values >=40.