Hi Mike,
274 represents the number of call legs. Generally a call on the gateway will have two call legs so the no of actual calls will be equal to half of the number of call legs. You can check your CUBE / router configuration if it has 'allow-connections h323 to sip' configured to account for h323 call legs. Please check the following link for some more details
https://supportforums.cisco.com/document/123281/how-check-active-call-count-sip
HTH
Manish