this depends on your trunking, form 4 option 21, incoming to outgoing call forward enable, then in cos of extension enable trunk to trunk connect, i.e. DiD to DiD connect option 318, then in form 30 enable the connection of your type of trunks, i.e. allow 6 to 6, then in form 31 enter the cell number, then forward then extension to the speed call bin, access code then bin number
