View source for DUM Client Outbound Support

====Server Side====
Repro can be configured to add a Flow-Timer header to a registration response, if it is either the registrar or an edge proxy supporting outbound.  The repro command line option --flow-timer is used to enable this.  Using this command line option will also enable a new aggressive garbage collection mode for connections.  Normally the stack will only garbage collect TCP connections when the OS indicates that it is out of FD's.  With aggressive garbage collection enabled, the stack will look for stale connections every time a new connection is formed.  With the repro flow-timer command line option enabled, the stack will cleanup connections that are associated with a Flow-Timer if they haven't received a keepalive "ping" message (or any other message) by the configured flow-timer interval, plus a configured grace period.  It will cleanup connections that are not associated with a Flow-Timer after a hard coded time of 2 hours without receiving any inbound messages on the connection.  New settings/methods to support this are:
*InteropHelper::setFlowTimerSeconds - if set to greater than 0 then a Flow-Timer header is added to local generated REGISTER/200 response or a proxied one if outbound is being used (this is the edge proxy case).  Default is 0 (disabled).
*InteropHelper::setFlowTimerGracePeriodSeconds - this value is used by the stack to decide when connections that are using a flow-timer have timed out.  Default is 30 seconds.
*ConnectionManager::EnableAgressiveGc static member setting - if enabled this will cause the connection garbage collection to run every time a new connection is formed, instead of just when we run out of FD's
*ConnectionManager::MinimumGcAge - this specifies how many seconds a connection can go without receiving any traffic before it is considered stale/bad.
*SipStack::enableFlowTimer method on the SipStack - this takes a Tuple parameter and will "tag" the specified connection as being one in which we want to implement flow-timer timeout logic on.  Repro calls this method if it adds a Flow-Timer header to a registration response.