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( ",
, " );
fsm.FindTransactionAndAddEvent( invite );

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

Joegen

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