SIP trunk between Cisco Call Manager


I am new to freePBX. I installed the pbx version 2.10 and registered one extension. I also have Cisco Call manager 5 connected with PSTN. I am trying to create a SIP trunk between Freepbx and Cisco call manager so i can use PSTN through my SIP trunk. I follow some of the forums to create a trunk but unfortunately my calls are not going through. i am also not sure is my trunk establish or not. Please help me out to resolve this issue.