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.

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.

Nippon Telegraph and Telephone - Nippon Telegraph and Telephone is a Japanese telecommunication service that provides fixed-line telephone, mobile phone, broadband, digital TV, Internet TV, and information technology services with millions of worldwide users.

Vodafone Group plc - Vodafone Group plc is a British-based multinational telecommunication organization that provides fixed-line telephone, mobile phone, broadband, digital TV, Internet TV, IPTV, and Internet of things services with millions of beneficiaries.

Mitel - Business Communications and Collaboration