CLI_ninja,
That all depends on what type of trunking you have associated with that CO Trunk Group.
If it is an ISDN type trunk then you will need to get into Command Line of the controller and run the ISDN Diagnostics and then you see what it is sending out for data.
If it is SIP then you just need to turn on the SIP Logging and you can see what it is sending out within the SA&D tool.
If it is a Loop Start Trunk then you will need to get a digit grabber and hook it up.
Thanks,
TE