My take - you should be using both: Example - <!-- this controls failure action on the dial-plan level --> <action application="set" data="continue_on_fail=ALLOTTED_TIMEOUT"/> <!--the fail_on_single_reject is key here - it is at the call leg level and fails such that a second call is not pushed through to the fail-over carrier--> <action application="bridge" data="{leg_timeout=10,fail_on_single_reject=ALLOTTED_TIMEOUT}user/1001|user2/1001"/> <action application="bridge" data="{leg_timeout=30,fail_on_single_reject=ALLOTTED_TIMEOUT}user/1002|user2/1002"/> So in this scenario - you have "continue_on_fail" to ensure that 1002 WILL BE called if 1001 times out, and fail_on_single_reject to ensure that 1001 will not be called a second time through the failover carrier. Phil