This parameter enables PRACK support through adding End-To-End PRACK.
This parameters addresses an issue when the E2Eprack is enabled and the ingress/egress 100relsupport is disabled, then the SBC was rejecting PRACK with a 405 bad request obtained from the ingress side.
% set addressContext <name> zone <name> sipTrunkGroup <name> signaling proxyBehaviorFor18xWhenE2EPrackEnabled <disabled | enabled>