Call Forwarding Not Reachable I 'CFO' Call Forwarding in Gateway (Unknown) 'CFU' Call Forwarding Unconditional 'CFUK' All Forwarding 'CGC' a Advice of Charge Charging 'CGI' Advice of Charge Information 'CIAC' Account Code Service 'CICUG' Closed user Groups Service 'CIPCI' Proprietary Customer Information a