i did some more presence tests with jitsi. when i start jitsi, it
registers its sip uri, subscribes to its own presence.winfo and presence
of another uri, and publishes its own presence.
when i then quit jitsi, it un-publishes its own presence, un-subscribes
presence of the other uri, unregisters its own sip uri, and closes its
tcp connection to kamailio. it does unregistering/closing before it has
received notify from kamailio presence server to the un-subscribe. when
presence server then tries to send the notify, it fails with syslog
error, because tcp connection does not exist anymore.
conclusion: presence in jitsi is still broken.
-- juha