[OpenSIPStack] New Parallel Forking Support

[<jo...@op...>]

Hello Everyone,

I am happy to announce that parallel forking is now supported by 
OpenSIPStack and OpenSBC.   For OpenSBC Users, Parallel Forking will be 
enabled by setting the fork parameter in B2BUA Route Entry like so

[sip:1111*;fork=true] sip:gw1.domain.net:5060, sip:gw2.domain.net:5060, 
sip:gw3.domain.net:5060

Instead of the usual serial fail-over, OpenSBC will send out 
simultaneous INVITEs to all three routes.  The first to send a 183 with 
media or a 200 final response among the three routes will be used by 
OpenSBC to process the call.  The remaining two forked calls will be 
CANCELed.


For OpenSIPStack users,  parallel forking is accomplished by setting the 
"PARALLEL-FORK"  internal header of the INVITE you want to send


SIPMessage invite;
/// Pupulate INVITE headers here
SIPHeader fork( "PARALLEL-FORK" );
fork.SetHeaderBody( "<sip:11...@gw...:5060>, 
<sip:22...@gw...:5060>, <sip:33...@gw...:5060>" );
fsm.FindTransactionAndAddEvent( invite );


Thats it.  The transaction layer will take care of forking your request 
and canceling abandoned forks.

Joegen