[Users] ACK ACK ACK

Mark Kent mark at noc.mainstreet.net
Wed Mar 14 05:21:11 CET 2007


Hello,

It's been a little while since I last posted, but this
will look familiar to those who remember:

The scenario is this:

 Phone sends openser an invite, which tries to set things up with the
 PSTN gateway, which is unresponsive(*), and so it sends back to the
 Phone:

 SIP/2.0 503 Service not available

 and the Phone sends back an ACK.

What should I do with that ACK?

One possibility is to do nothing, another possibility is
to t_relay() it.

What suprised me was that when I do nothing then another 
"SIP/2.0 503 Service not available" 
message is automagically sent to the Phone.  
So, that can't be the right thing to do.

Meanwhile, when I t_relay() it then things usually work.  
But this doesn't seem like the right thing to do, since the 
ACK is meant for the very box on which I'm doing the t_relay().

So, what's the story?   

Thanks,
-mark

(*)don't worry about why the PSTN gateway is unresponsive.




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