Attention Multiline Telephone System Users

A multi-line telephone system, or MLTS, is a telephone system comprised of common control units, telephones, and controls providing local telephone service to multiple end-users. Many businesses, government agencies, hotels, and schools use these types of telephone systems.

Must Provide:

  • Callback number for the “station” calling, A redial will reach the 911 caller directly.
  • Dispatchable Location:
  • Validated Street Name and number
  • Building, Floor, and/or Unit Identifier
  • Room level identification if sleeping quarters

Must Be Able To:

  • Directly dial 911 without the use of a prefix.
  • Attach a sticker in bold type as to dialing instructions if the unit doesn’t allow the caller to directly dial 911 without the use of a prefix.

More information can be found at:  https://www.mass.gov/service-details/multi-line-telephone-system-mlts-regulations-information-and- resources

Questions and compliance issues can be sent to: mlts911@mass.gov
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