TK-832 (1A) 8co 64 lines telecommunication digital pabx system for phone Product DescriptionModel:TK-832 (1A) 864 (8CO lines + 64extensions)8CO line + 64Ext LINECAPACITY:8CO LINES. 16,24,32,40,48,56,64 EXT LINESexpand to 16+128ADD on-Spares TK-848-008 TONE boardPSC- powerIVR navigation-six segment telephonist of computerMSP charging..