[Serdev] Concept for a SIP cluster implementation

[Klaus Darilion]

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 :-(

klaus


> 
>   - Mysql cluster is the way to go, mysql replication is too complex and
>     not reliable (it is hard to keep the machines synchronized under
>     high load).
> 
>      Jan.
> 
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