You might want to engage an AvayaPartner or a friend with more experience, at least for the first time.
First thing, you don't need to get int your g450 at all. You need to get into your CM Core -- this could be any variance of a few servers: S8300, S8800, VMWare, S8500 etc
Commands to be looked at:
"cha ds1 XXXXX"
"cha trunk XXX""
"cha sign XXX"
busy/release board XXXX
and the best one:
"test board XXXXX" and use google to find the "meaning" to the test results.