I use pbxes.org (asterisks based) to manage my SIP services. I created an extension for my N800 and am using the default client on the N800. Everything works fine for the first few minutes or so after I connect, that is, I can make and receive calls just fine.

Unfortunately, after leaving my n800 to sit, it eventually half disconnects. That is, pbxes.org shows my device is no longer connected and will not allow my n800 to make/receive calls until I go to my n800 and cycle Presence Off and On again. HOWEVER, my n800 shows both GoogleTalk and SIP Connected. It never shows SIP in a disconnected state, despite what pbxes.org shows.

I've played around with Keep-alive mechanism and Keep-alive frequency in the Advanced SIP Settings, but this is not documented well in the help (is frequency in Minutes? Seconds? Hours?). I've tried frequency values of 1, 2, 127, 120, 123, 117 and cycled the mechanism through all of it's options.

Anyone else experience this problem? Is there a solution? This will cause me to miss calls.