See also:

• Business: Telecommunications: Equipment (2,004)
• Business: Telecommunications: Services: Phone Cards (47)
• Computers: Internet: Protocols: SIP: Service Providers (5)
• Computers: Internet: Telephony (38)

• IPgrade
  ipgrade.com
  B2B Wholesaler of VoIP-based Phone-to-Phone, PC-to-Phone, DDI, VPN, CRM, prepaid calling cards, and broadband services.
• World On IP
  worldonip.com
  Italy-based B2B VoIP provider offering hardware to set-up wireless VoIP networks.
• SunISP
  sun-isp.com
  SIP based VoIP phones and service plans with focus on Caribbean and South America.