Telefonica - Telefonica is one of the largest telephone operators and mobile network providers, including fixed and mobile telephony, broadband, and subscription television services, based in Spain, headquartered in Madrid.

RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies

America Movil - America Movil is a Mexican Telecommunications Corporation that provides wireless and fixed operations with a specific networking group, including fixed-line, mobile telephone, broadband, and digital TV services.

Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...

Orange S.A - Orange S.A is a French multinational telecommunication corporation that provides mobile networking with fixed-line telephone, mobile phone, broadband, IPTV, and Internet bank services to millions of worldwide users.

Eir SIP Voice - eir SIP Voice is revolutionizing the core communications tool of business that carries both calls and data over just one connection.