Under Hung Groups Settings, on Group1, uncheck Obitalk settings and device defaults. Type gp(1)={ph1+ph2+ph3+ph4+ph5+ph6+ph7+ph8};du10;np=0
Then under SP1, X_InboundCallRoute, uncheck Obitalk settings and device defaults, erase {ph1} and type gp(1)
Don't forget to click Submit for both changes to save settings.
This should activate hunt group. (e.g. If line 1 is busy, line 2 rings, if lines 1,2 are busy, line 3 rings, and so on.)