This read-create Integer32, in seconds from 1 to 1000, defines the retention window ('recent') for which the gateway keeps in memory the responses it sent and the transactions currently executing under the MGCP protocol, whose UDP transport can lose messages and trigger command repetition. Admins tune this to ensure duplicate commands from repeated transmissions are correctly recognized as duplicates rather than reprocessed. For example, an admin seeing duplicate call-setup side effects during network retransmissions might raise this timer so the gateway remembers recent transactions longer.