Non-Compliant MLTS Registry

Non-Compliant MLTS Registry (as of 5-30-25)

Key to Abbreviations:  CBN = Call Back Number, CR = Call Retention, DD = Direct Dialing,  
DL = Dispatchable Location, MRC = Misrouted Call, PNC = Provided Non-Compliant MLTS,  
PV = Failure to Pre-Validate
 

For a complete description of the MLTS Issue, scroll down to the bottom of the page below the list. 

Communication Service Providers (CSPs)

MLTS Owner/Operators 

MLTS Non-Compliance Issue Categories

“CBN” refers to:  Call Back Number. A number used by a PSAP to contact the location from which the 911 call was placed. This number shall allow a call from the PSAP to reach the station used to originate the 911 call, or the number of a switchboard operator, attendant, or other designated on-site individual with the ability to direct emergency responders to the 911 caller's location 24 hours per day, seven days per week, 365 days per year

“CR” refers to:  Call Retention.  911 calls are not being automatically routed to the PSAP of Jurisdiction but are being retained at the entity’s location.

“DD” refers to:  Direct Dialing:  A person engaged in owning, managing, configuring or operating a multi-line telephone system that provides outbound dialing capability or access shall configure the system to allow a person initiating a 9-1-1 call on the system to directly access 9-1-1 service by dialing in order the digits 9, 1, and 1 without an additional code, digit, prefix, postfix, or trunk-access code. All non-compliant devices that provide outbound dialing capacity or access must have immediately adjacent to, and optionally on, the device an instructional sticker instructing the user how to access 9-1-1 service. The instructional sticker must be printed in at least 12-point boldface type, in a contrasting color using a font that is easily readable and is written in English and Spanish.

“DL” refers to: Dispatchable Location Information. The location delivered to the PSAP with a 911 call that consists of the validated Location Database (LDB) street address of the calling party, plus additional location information such as: building name or number (if more than one building shares the same street address), floor number (if more than one floor), suite name or number, apartment name or number, and room name or number or similar location information necessary to adequately identify the location of the calling device. ERL Identifiers and Unit Identifiers are forms of dispatchable location information. For devices located in sleeping and/or living quarters, dispatchable location information shall include a room name or number.

“MRC” refers to:  Misrouted 911 Call:  911 Call misrouted to the wrong PSAP because of incorrect or faulty location information.

“PNC” refers to:  Provided a Non-Compliant MLTS.  The entity provided an MLTS that was not compliant with the MLTS Regulations of the Commonwealth and/or the FCC on the day it went live.

“PV” refers to:  Failure to Pre-Validate civic addresses.  Civic addresses must be pre-validated against the Commonwealth’s Location Database (LDB) through the Location Validation Function (LVF).
 

“Working Towards Compliance” refers to entities that have responded to either a First Notice of MLTS Non-Compliance Letter or a Second Notice of MLTS Non-Compliance Letter and are working towards compliance with the Commonwealth’s MLTS Regulations.

“Not Cooperating” refers to entities that either have not responded to a Second Notice of MLTS Non-Compliance sent via certified mail or have responded but are not making satisfactory progress in working towards compliance with the Commonwealth’s MLTS Regulations.

“First Notice Sent” refers to entities that recently have been identified as being non-compliant with the Commonwealth’s MLTS Regulations and have been sent a First Notice of MLTS Non-Compliance Letter to which they have not responded but are still within the 30-Day period allowed for a timely response.