Interphone has an unrivalled understanding of building security and automation technologies, providing design, installation and maintenance services for the commercial residential marketplace. Interphone's management and control solutions combine a wide range of building systems including access control, CCTV, gates and barriers, distributed television, fire and emergency detection, LED lighting, door entry, concierge and property management.

The company provides services in the following fields: manned security, mobile patrols, commercial guarding, key holding, alarm response, commercial guarding retail guarding, public sector guarding. MJF Corporate Guarding currently holds Security Industry Authority (SIA) 'Approved Contractor Scheme' (ACS) status for the provision of security guarding and key holding sectors.