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On session registration, if device is already reporting that it is connected to a device, an innocuous packet (update time) is sent to the already connected device. If the tcp connection is down, the device will be unregistered and the new connection allowed. Without this patch, network issues can see a situation where a device can not reregister until after 3*timeout. git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/12@404292 65c4cc65-6c06-0410-ace0-fbb531ad65f3