### Question
How is the term multi-line telephone system” or “MLTS defined?


### Answer
The term **multi-line telephone system” or “MLTS** is defined in *47 U.S.C. § 1471* as the following:

> a system comprised of common control units, telephone sets, control hardware and software and adjunct systems, including network and premises based systems, such as Centrex and VoIP, as well as PBX, Hybrid, and Key Telephone Systems (as classified by the Commission under part 68 of title 47, Code of Federal Regulations), and includes systems owned or leased by governmental agencies and non-profit entities, as well as for profit businesses

#### Citation:
  - *47 U.S.C. § 1471*
  - Heading: **CHAPTER 13-PUBLIC SAFETY COMMUNICATIONS AND ELECTROMAGNETIC SPECTRUM AUCTIONS > SUBCHAPTER V-NEXT GENERATION 9&ndash;1&ndash;1 ADVANCEMENT ACT OF 2012**

