Hi,
Facing one issue at one my site, while users are roaming with their Cisco 7921 IP Phone they are frequently getting disconnected and phone is giving this message "Leaving Service Area". Recently CUCM has been upgraded to Version 9 from CUCM 6. Current WLC Model is 4402 and Version is 4.X. Below i am mentioning all the details....response really appreciated.
Wireless Information:
Cisco 4400 Series WLAN Controller
AIR-WLC4402-50-K9
Software Version: 4.2.130.0
AP/LAP: Cisco AIR-LAP1252AG-E-K9
IPT Information
Firmware Version for IP Phone:cp7921g-1.4.5.3.loads
cucm version: 9.1.2.11900-12