• http://www.voipgate.com/
• http://www.callworks.com/
• http://www.call2.com/
• http://www.callrewards.com/
• http://www.cheapcall.convey.net/
• http://www.ctdepot.com/
• http://www.dialpad.com/
• http://www.efusion.com/
• http://www.freetel.inter.net/
• http://www.goldcall.com/index.htm
• http://www.hmnet.ca/
• http://www.itelco.com/
• http://www.itserv.com/
• http://www.polyphone.com/
• http://www.latic.com/
• http://www.mibridge.com/
• http://www.net2phone.com/
• http://www.netpbx.com/
• http://www.netspeak.com/
• http://www.ncic.com/
• http://www.nexcell.net/  - Call to any Telephone in the world
• http://www.rebelsoftware.com/
• http://www.spiritec.com/
• http://www.vocaltec.com/
• http://www.voxo.com/
• http://www.opensaysme.com/
• http://www.zeroplus.com/

All Rights Reserved. Like to add some more links drop here.