Updated: Thursday the 24^th of May, 2012 Telecom Systems: ISDN (Integrated Services Digital Network)

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Academy Networks Ltd - Wokingham
Advance Networks Limited - Leicester
Attended Net Company Limited - Letchworth Garden City
Auditronic Services - Sutton
Beyond Digital Systems -
BGT - Walsall
Britannic Technologies - Guildford
Combined Office System Services - Hemel Hempstead
Coordinate It Ltd - Nantwich
Countryside Automation Ltd - Chelmsford
Creative Digital Solutions Ltd - Hatfield
Creative Networks Ltd - Rochdale
Data Integration Ltd - London
Datasharp Thames Valley Ltd - Maidenhead
Digital Office Systems Uk Ltd - Cambridge
Digital Sign Services Ltd - Guildford
Dmn Installations Ltd -
Elan Networks Ltd - Glasgow
Electronic & Security Services Ltd - Belfast
End Systems Ltd - Leigh
Exchange Communications Ltd - Kirkintilloch
Fastener Network Holdings Ltd - Dudley
First Choice Computers (West Midlands) Ltd - Wolverhampton
Freeclix Ltd - Norwich
Freelance Network Services - Reading
Gb Efficiency Services Ltd - Leeds
Gb Integrated Systems Ltd - Nelson
Global Crossing (UK) Telecommunications Ltd - London
Grove Net Ltd -
Gxs - Sunbury-on-thames
Iat Services Ltd - Kingston Upon Thames
Icam Archive Systems Ltd - Northampton
Ict Management Services Ltd - Doncaster
Ideal Integration Ltd - Hertford
Image Audio Visual Solutions - Didcot
In2Security Networks Limited - Leicester
Integral Powertrain Ltd - Milton Keynes
Integrated Business Telecom - Ware
Integrated Graphics Ltd - Barry
Integrated Results - Skipton
Inter-group Communications Ltd - Southport
Ion Systems - Thatcham
Jet Telecom - Bournemouth
Karlan Digital Ltd -
Konnectivity Limited - Harrogate
L A Systems Ltd -
Laheen Systems Ltd - Congleton
Lanode Ltd - Camberley
Link Communications Systems Ltd - London
Lithium Telecom Ltd - Alloa
Local Telecom Service Ltd - York
Lockheed Martin Uk Integrated Systems & Solutions Ltd - Farnham
M B A Systems Ltd - Winchester
Magic Box Systems Ltd - London
Meridian Audio Ltd - Huntingdon
Metascybe Systems Ltd - Wetherby
Mps Uk - High Wycombe
Netlog Technology Ltd - Merthyr Tydfil
Network Cabling Services Ltd - Hornchurch
Network Defence Ltd - Newton-le-willows
Network Ltd - Southam
Network Roi Ltd - Roslin
Network Services Ltd -
Network Techniques Consulting Ltd - Hemel Hempstead
Nortech Network Services Ltd - Northampton
Norwest Digital Communications Ltd - Ellesmere Port
Ntl:Telewest Business - Hook
Oncoreit - London
Oni plc - Luton
Organic Digital - Glasgow
Paralogic Ltd - Aylesbury
Paramount Window Systems Ltd - Bolton
Parkway Computer Services Ltd - Welwyn Garden City
Plum Communications - Oldham
Portset Systems - Southampton
Ptc Systems Ltd -
Quell Systems Ltd - Fareham
Redleg Net Ltd - Preston
Rex Group Services Ltd -
Rexodan International Ltd - Widnes
Roof-pro Ltd - Bedford
Russell Telecom Ltd - Gateshead
Sbm Digital Systems Ltd - Shifnal
Select Business Products Ltd - Hull
Select Telecommunications Ltd - Ely
Shire Integrated Systems Ltd - Bristol
Shout Telecoms Ltd - Waterlooville
Sigma-securitech.com - Harlow
Signet (A C) Ltd - Washington
Solar Communications Ltd - Chippenham
Star Net Geomatics Ltd - Livingston
Strawberryfields.com Ltd - Caldicot
Stream Communications Ltd - Glasgow
Systemcare Uk Ltd - Worthing
T James Telecoms Ltd - Kettering
Takeda Technology Ltd - Northwich
Technology Assurance Ltd - Swindon
Tees Valley Telecom Ltd - Middlesbrough
Telephone Systems - Basingstoke
White Lightning Solutions Limited - Godalming