AT&T is a leading global provider of telecommunications, wireless, and broadband services.

iTelco Communications: A global provider of scalable IP-based solutions for unified messaging, advanced telephony, and wireless applications.

YupiCall: A versatile international calling service, no internet or smartphone required.

Infratel Inc.: Global provider of cloud telephony services, empowering small businesses with professional communication solutions.

Chinook Communications: Streamlining business operations with affordable, integrated communication solutions.

Super Technologies, Inc.: A leading US provider of global voice and data telephony services.

IP Unity offers a carrier-grade platform for enhanced voice and telephony applications, ensuring cost-effective network services.

Leading VoIP provider with advanced technology for high-quality voice traffic over the Internet.

Hamilton County Communications: Illinois-based provider of internet, Wi-Fi, and telephone services.

Comporium Communications: Your all-in-one provider for phone, internet, cable, and home security services.

Nx Networks, Inc. offers global network infrastructure services, internet telephony, and data solutions.

StarVox: Providing integrated IP telephony solutions through major providers like HP.

Axesstel, Inc. offers wireless voice and broadband solutions with advanced 3G and 4G gateway devices.

TriVergent is a leading integrated communications provider offering DSL internet, web design, hosting, and telephony services.

InterPacket, a California-based company, provides global satellite-based Internet services, including broadband, telephony, and content distribution.

Carolina BroadBand Inc. offers comprehensive broadband multimedia services including cable, internet, and telephony.

Pervasip Corp: A wholesale VoIP provider offering local to international voice services over wirelines and broadband.

Boston-based eYak provides IP telephony services and voice application solutions since 1999.