The model a circuit switching network with edge-disjoint alternative paths Long-lived calls · Short- lived calls Preemptive priority of long -lived calls Poisson arrival of connection requests exponentially distributed holding times Mean holding time of long-lived calls much longer than short lived ones (200) a maximum number d of overflow attempts trunk reservation to reserve certain resource to primary path connectionsThe model • A circuit switching network with edge-disjoint alternative paths • Long-lived calls • Short-lived calls • Preemptive priority of long-lived calls • Poisson arrival of connection requests. • exponentially distributed holding times • Mean holding time of long-lived calls much longer than short￾lived ones (200) • a maximum number D of overflow attempts • trunk reservation to reserve certain resource to primary path connections 17