[Freeswitch-users] Where does the FS keep the call-id list?

Hi all, I am new to FreeSwitch, I have a question when using SIPp <-> FreeSwitch <-> SIPp. The SIPp UAC create many calls and the SIPp UAS does reveive them. I wonder if anyone can tell me, where does the FreeSwitch keep the call-ids? Is there a list to contain all the call-id? If there is a list, how can I found it? Best Regards! Shawn Lin