This OID specifies the number of seconds to wait after all voice calls drop before the system releases the underlying ATM Trunking Bearer VCC connection. Engineers set longer timers when expecting frequent call retries (to avoid SVC teardown overhead) and shorter timers in bandwidth-constrained networks to reclaim resources quickly. For example, setting this to 120 seconds means a trunk remains allocated for up to 2 minutes after the last call ends, allowing fast reconnection if a new call arrives within that window.