Thanks for your reply, Klaus.

I tried to force a priority on ACK messages, putting in begining's script file the 'relay control'. But it didnt work. The INVITE is forward first. If somebody knows how to do that, please, let us know.

Thanks

Bruno Machado

Klaus Darilion klaus.mailinglists@pernau.at escreveu: Bruno Machado wrote:

Hi all

Im in trouble with this problem: I have a Openser the connect to a carrier. I need that this proxy answer the messages in order that it receive. In my situation, other device one hope behind it, sends an ACK and, miliseconds after, it sends an INVITE to change the session. The server where the Openser is installed receive the ACK first than INVITE, but it ALWAYS forward this INVITE first. This way, I cant connect my proxy to the carrier. I need to know how I can change this behavior: the SIP proxy needs to send the ACK first. First in, first out..... Anybody knows how to do it?

Hi!

The client which receives the reINVITE before the ACK should be smart enough to accept the reINVITE (which is also an implicit ACK), and then ignore the late coming ACK.

btw: I've also seen this phenomenon recently when testing with SIPP. The basic scenario sends INVITE-ACK-BYE. The BYE is sent immediately after the ACK. In openser, the BYE overtakes the ACK - everytime. Is there some special processing for ACK which takes more time the for other in dialog requests?

regards Klaus

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