I have a remote site customer with a Cisco WLC 4404 and 1130 Access Points. They are using SpectraLink wireless phones with no probem for about 6 months. Recently, there is about a 1 second latency when using the IP Phones. NetStumbler is seeing various signaling to go low as it roams from 1 AP to another. The distance between the 3 APs is 85 feet. What is the best way to troubleshoot this problem? Can we do anything with the AP to enhance the signaling during the roaming process?
The initial firmware was 22.214.171.124 and has been upgrade to 5.0.148 to see if it helped. It didn't.
Any help would be appreciated.