The Official Telesis A.S. Linkedin Page: Established in 1983, Telesis A.S. has grown rapidly as a leading-edge provider of solutions for IP Telephony and TDM Telephony applications. With 35 years experience, Telesis A.S. has delivered to its customers over 5 million lines and users. Our products have been chosen by public- and private-sector entities in various countries worldwide. Telesis systems have been installed in dozens of countries. Telesis A.S.`s excellent reputation in international markets rests on excellent product design and a competitive cost/performance ratio.