This Unsigned32, in call-legs per second, reports the maximum rate of call legs (as opposed to whole calls, which may involve multiple legs) observed during a given period and interval. Administrators use it because call-leg rate can spike independently of call rate on gateways handling complex multi-leg scenarios like transfers or conferencing, making it a more precise capacity metric for signaling load. For example, a spike in call-leg rate without a corresponding spike in call rate would suggest an increase in transfers or conference calls rather than simple call volume.