[Discover] Callcentric - internet phone service http://www.callcentric.com/
(phone voip provider telephony) 
[Discover] O2 – The UK's Leading Provider of Mobile Phones & Broadband http://www.o2.co.uk/ (uk mobile provider iphone)
[Discover] Diamondcard VOIP, IAX Softphone, Call Shop Billing, VOIP Private Label, DID's http://www.diamondcard.us/ (provider sip voip)
[Discover] VoiceStick.com - The Internet Phone for cheap local and long distance calling http://www.voicestick.com/Index.aspx (voip provider sip)
[Discover] Free International Call, free global phone calls, Free VoIP Phone Line, Free Long Distance Free ... http://www.myphoneline.com/free_phone_service/ (provider voip)
[Discover] SIP Service Providers directory / SIP Tradeshow / Service Providers http://www.sipcenter.com/sip.nsf/html/Service+Providers (provider sip service asterisk)
[Discover] VoIP - International Voice Over Internet Provider - voipGATE http://www.voipgate.com/site/ (provider voip)
[Discover] O2 – The UK's Leading Provider of Mobile Phones & Broadband http://www.o2.co.uk/ (uk mobile provider iphone)
[Discover] Diamondcard VOIP, IAX Softphone, Call Shop Billing, VOIP Private Label, DID's http://www.diamondcard.us/ (provider sip voip)
[Discover] VoiceStick.com - The Internet Phone for cheap local and long distance calling http://www.voicestick.com/Index.aspx (voip provider sip)
[Discover] Free International Call, free global phone calls, Free VoIP Phone Line, Free Long Distance Free ... http://www.myphoneline.com/free_phone_service/ (provider voip)
[Discover] SIP Service Providers directory / SIP Tradeshow / Service Providers http://www.sipcenter.com/sip.nsf/html/Service+Providers (provider sip service asterisk)
[Discover] VoIP - International Voice Over Internet Provider - voipGATE http://www.voipgate.com/site/ (provider voip)