This OID stores the heartbeat timer T(beat) in milliseconds, which controls how often the system sends keepalive packets to verify that the signaling connection remains alive. A network engineer configures this to detect dead connections quickly without wasting bandwidth, typically keeping a balance between responsiveness and efficiency. For example, a heartbeat timer of 30000 means the system sends a heartbeat every 30 seconds, allowing it to detect a dead connection within one minute.