[Freeswitch-users] How to Set Call Priority in mod_callcenter

Dear All, I have set queue parameter to <param name="time-base-score" value="system"/>,so now how to raise some caller's score,allows them to receive priority over other normal calls that might have been in the queue longer. I have test above scenario using <param name="time-base-score" value="system"/> which is not fulfill my requirement,if there is any parameter to set this scenario. Pl help me to set this scenario. Thanks and Regards Amit Nakum