• Aggregated Telecom Ltd
  Prophecy House, 87 London Street, READING, Berkshire, RG1 4QA
• Allcoms Ltd
  37 Verlam Grove, DIDCOT, Oxfordshire, OX11 7SW
• Alternative Communication Systems
  Acer Court North Leigh Business Park, Nursery Road, North Leigh, WITNEY, Oxfordshire, OX29 6SW
• Alternative Communication Systems
  Unit 18-19 Kings Meadow, Ferry Hinksey Road, OXFORD, Oxfordshire, OX2 0DP
• Berkshire Telephone Systems
  PO Box 4229, Goring, READING, Berkshire, RG8 9XT
• Connect 2
  Park Farm Technology Centre, Akeman Street, Kirtlington, KIDLINGTON, Oxfordshire, OX5 3JQ
• Electrical Design & Installation & Network Communications Ltd
  2 Church Road, Cholsey, WALLINGFORD, Oxfordshire, OX10 9PP
• European Telecom Systems
  3 Foxcombe Court, Wyndyke Furlong, ABINGDON, Oxfordshire, OX14 1DZ
• MG Communications
  2 Brookside, Cholsey, WALLINGFORD, Oxfordshire, OX10 9NN
• Mavisat Ltd
  2 Wokingham Road, READING, Berkshire, RG6 1JG
• Mecatronic
  72 Dunnock Way, OXFORD, Oxfordshire, OX4 7WH
• N S T & T Universe
  72 Coleridge Drive, ABINGDON, Oxfordshire, OX14 5NT
• Oxford Electronics
  5 Kendall Cresent, OXFORD, Oxfordshire, OX2 8NE
• Oxloc
  Unit 5 Begbroke Business & Science Park, Sandy Lane, Yarnton, KIDLINGTON, Oxfordshire, OX5 1PF
• Ozone Security Service Ltd
  93 Barns Road, OXFORD, Oxfordshire, OX4 3RA
• Packet Data Systems Ltd
  PO Box 48, Pangbourne, READING, Berkshire, RG8 7EG
• Telephone Systems
  57 Grove Road, Emmer Green, READING, Berkshire, RG4 8LJ
• The Union Telecom Co
  Old School, Asthall, BURFORD, Oxfordshire, OX18 4HW
• Voice Active Ltd
  Unit D3, Station Yard, THAME, Oxfordshire, OX9 3UH
• Wilcom-Systems.Com
  Ploughmans, Whitehall Lane, Checkendon, READING, Berkshire, RG8 0TN
• Worldwide Communications Bureau Ltd
  103 Wokingham Road, READING, Berkshire, RG6 1LH