As time went by, Siemens, Alcatel-Lucent, Cisco, Nortel, Avaya, Wildix and Mitel realized the potential for eliminating the traditional PBX or key system and replacing it with a solution based on IP.
Шло время, Siemens, Alcatel-Lucent, AltiGen, Cisco, Nortel, Avaya и Mitel поняли потенциал роста IP-телефонии и начали внедрять в основном системы, работающие по IP.