I managed to upgrade the phone to 8.2.2SR1 after renaming jar70sip.8-2-2ES1.sbn to Jar70sip.8-2-2ES1.sbn but the phone would continually say "Registering" and the red X next to the phone icon. The phone would eventually time out and couldn't make incoming or outgoing calls. Then I disabled registering with the proxy with the following line in the config: <registerWithProxy>false</registerWithProxy> The "Registering" line didn't appear but the red X was still there. I could make outgoing calls but couldn't receive them. Next I deleted the following lines. <backupProxy>192.168.20.2</backupProxy> <backupProxyPort>5060</backupProxyPort> <emergencyProxy>192.168.20.2</emergencyProxy> <emergencyProxyPort>5060</emergencyProxyPort> <outboundProxy>192.168.20.2</outboundProxy> <outboundProxyPort>5060</outboundProxyPort> and changed the registerWithProxy back to true as follows: <registerWithProxy>true</registerWithProxy> The phone no longer got stuck with "Registering", the red X is gone, and I can make and receive calls. I'm not sure if there are other settings that are critical to this working but this was the last thing I tried before it started working. I'll post this to the wiki shortly.