Aql – http://www.aql.com
Babble.net Limited – http://www.babble.net
Blue Telephony Ltd – http://bluetelephony.com
Bon.net Limited – http://www.bon.net
BT – http://www.bt.com
Ciptex Ltd – http://www.ciptex.com
Club Communications – http://www.club-comms.co.uk
CommsSolutions – http://www.commssolutions.com
Coms plc - http://www.coms.com/
Easy-Dial Ltd – http://www.easy-dial.com
Econet Carrier Services – http://www.econetcarrier.com / http://www.liquidtelecom.com
Entatnet International Ltd – http://www.enta.net
Gamma Telecom – http://www.gammatelecom.com
Gradwell Dotcom Ltd – http://www.gradwell.com
Inet Telecoms Ltd (Voipfone) –http://www.voipfone.co.uk
Inuk Networks – http://www.inuknetworks.com
The Internet Phone Company Ltd –http://www.internetphoneco.com
Magrathea Telecommunications Limited –http://www.magrathea-telecom.co.uk/
nPlusOne Limited – http://www.nplusone.net
Netplan Internet Solutions LTD –http://www.netplan.co.uk
NewVoiceMedia – http://www.newvoicemedia.com
Opal Telecom - http://www.opaltelecom.co.uk/
Orbis Telecom – http://www.orbistelecom.com
Primus Telecommunications Ltd -http://www.primustel.co.uk/
Quazzle – http://www.quazzle.co.uk
Ready Technology - http://www.readytechnology.co.uk/
Solutions11 Limited – http://www.solutions11.com / http://www.talkingplatforms.com
Solutios Limited – http://www.solutios.com
Spiritel Plc – http://www.spiritelplc.net
Talk On Limited – http://www.talkon.eu
Telappliant – http://www.telappliant.com
TelNG – http://www.telng.com
Timico Ltd – http://www.timico.co.uk
Touch Telecom Ltd – http://www.touchtele.com
Truphone – http://www.truphone.com
Velofone LTD – http://www.velofone.com
Viatel – http://www.viatel.com
Vodat Solutions Ltd – http://www.vodat.co.uk
Voicenet Solutions Ltd –http://www.voicenet-solutions.com
VoIPon Solutions – http://www.voipon.co.uk
Voiptalk - http://www.voiptalk.org/
VoIP User - http://www.voipuser.org/
VCOMM UK Ltd – http://www.vcomm.co.uk
VQ Communications Ltd – http://www.vqlive.com
WI-Manx Limited – http://www.wimanx.com
XConnect – http://www.xconnect.net
Zimo Communications Ltd – http://www.zimo.co.uk