- Viking door entry/ CCTV controller- Allows single line phones or phone systems to share a phone line with one or two Viking doorboxes or paging amplifiers- Provides two Touch Tone controlled relays to operate door strikes or gate openers and provides doorbox triggered CCTV camera switching- Switch between two CCTV cameras when either doorbox is activated- Handy as a line concentrator - one fax machine or answering machine can answer 3 lines- Doorbox triggered CCTV switching- Custom ringing mode allows you