I have no way to check it now,
let’s assume we have two pjsip trunks , each one to an ISDN gateway (i.e. Patton, Cisco, etc.)
Trunks are in sequence into an outbound route.
When all BRI circuits of first gateway are busy or out of service, is its state automatically reported back to pbx so calls are routed to the other trunk/gateway ?
Or a specific configuration must be done into gateway ?