[Serdev] Concept for a SIP cluster implementation

[Jan Janak]

On 27-09-2005 13:00, Klaus Darilion wrote:
> Jan Janak wrote:
> >  - A user agent does not have to send INVITE messages through the same
> >    proxy instance as REGISTER messages. The proxy server that received
> >    the INVITE request can make sure that the uac is reachable
> >    for the duration of the transaction by retransmitting the
> >    provisional response periodically (simulates NAT ping). All other
> >    transactions finish immediately and do not need this.
> 
> What happens in the callee hangs up (send the BYE)? This will be 
> loose-routed via the same proxy, which may not have a pinhole to 
> traverse the NAT :-(

  In my case the proxy would insert the IP of the correct proxy (the one
  that keeps the NAT hole open) because it knows it.

    Jan.