2009/8/27 Benny Prijono <bennylp at teluu.com>: > Good points. I added these in http://trac.pjsip.org/repos/ticket/937#comment:5 > > Thanks! Anything else? ;-) Well, I wonder which is the PJSIP UA beavior if it receives a 5XX for a refresh SUBSCRIBE (it could occur if the presence server has failed for a while) or a 408 or transaction timeout due to network problems. For example, in a topology like this: client ---------------- proxy -------------- presence-server if the presence-server crashes ar suffers a failure, the proxy couldn't contact it so it would reply 408 to the client. IMHO in all the above cases client should not terminate the subscription, but instead retry after some time. Probably the subscription could expire due to this temporal failure, so a "terminated;reason=timeout" would be received => subscribe again :) Many todays' SIP softphones terminate the subscription upon receipt of a "non expected" response (4XX, 5XX) for a refresh SUBSCRIBE. It could occur due to a temporal failure in the network, server... but the final conclusion is that SIP presence doesn't seem robust. Because of it, a good client should never terminate a subscription except in case it receives a NOTIFY "terminated" with reason "noresource" or "rejected". It's time SIP presence to rock! Regards. -- I?aki Baz Castillo <ibc at aliax.net>
