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What a multi-line telephone system is, what the law requires 911 calls to carry, and how to set up locations for rooms, floors and towers.
By the HotelGenie team · October 2026
Section 506 of RAY BAUM'S Act led the FCC to require a "dispatchable location" with 911 calls: the validated street address plus the room, floor or other detail responders need. For hotels, senior living communities and casino resorts, that rule applies through their multi-line telephone system (MLTS). Fixed phones had to send it automatically from January 6, 2021. Softphones, tablets and other devices that move had to follow from January 6, 2022, where technically feasible. Getting it right is mostly about the location data behind each extension.
MLTS stands for multi-line telephone system. Federal rules define it broadly: the control equipment, phones, software and add-on systems that let many extensions share outside lines. The definition names PBX, key and hybrid systems, Centrex and VoIP. It covers network-based (hosted) systems as well as equipment on the premises, and it applies to businesses, non-profits and government alike.
In practice, if your property has a PBX in a closet, a hosted or cloud PBX, or any setup where rooms and departments have extensions, you run an MLTS. The FCC names hotels, office buildings and campuses as typical places where they're installed.
RAY BAUM'S Act became law in 2018. Section 506 directed the FCC to consider rules so that a dispatchable location goes with 911 calls, whatever technology places the call. The FCC adopted those rules on August 1, 2019, in the same order that put Kari's Law into effect. Under the rules, whoever installs an MLTS may only install one that can be programmed with and send a dispatchable location, and whoever manages or operates it must make sure it's configured to do so.
The FCC defines dispatchable location as the validated street address of the caller plus additional information, such as suite, apartment or similar details, needed to adequately identify where the caller is. For a hotel, the "similar details" are the building, floor and room.
For multi-line systems, the rules depend on the kind of device:
Both dates have passed, so these are current requirements. The location rules sit alongside Kari's Law, which requires direct 911 dialing with no prefix and an on-site notification when 911 is called. Our Kari's Law guide covers that half.
The same Section 506 rules also cover fixed telephone service, interconnected VoIP and internet-based relay services, each with its own requirements. Wireless carriers fall under separate FCC location-accuracy rules.
The phone system doesn't "know" where a room is. Someone has to tell it. A working setup has three parts:
The address is the easy part. The detail that gets responders to the right door is what usually goes wrong. A few habits help:
Senior living communities and campuses add their own challenges. Residents may not be able to say where they are, apartments can be spread across several buildings, and the front desk may not be staffed overnight. Make sure every apartment's location names the building, floor and unit, and that 911 notifications reach staff who are on shift. We cover this in more depth in E911 for hotels and senior living, and on our senior living and casino resort pages.
HotelGenie E911 sends the room-level location to the 911 center, alerts your staff by SMS, email and voice, and works with phone systems on T1, PRI or SIP trunks.
Explore E911 / NG911Whether location comes from your phone vendor, your carrier or a separate E911 provider, ask:
HotelGenie E911 / NG911 sends the caller's room-level location to the 911 center, alerts staff right away by SMS, email and voice, and lets responders call the caller back. It works with phone systems on T1, PRI or SIP trunks, supports location labels staff recognize, and offers optional 911 call recording. With PhoneGenie Edge on site, 911 goes out a local line at the property even if the internet drops. For incidents staff need to raise themselves, there's Emergency Alert.
This article is general information, not legal advice. Confirm your property's obligations with counsel and your local 911 authority.
What is RAY BAUM'S Act?
RAY BAUM'S Act is a 2018 federal law. Section 506 directed the FCC to consider rules so that 911 calls carry a dispatchable location, meaning the street address plus details like floor and room, no matter what technology places the call. The FCC adopted those rules in 2019.
What is an MLTS?
An MLTS, or multi-line telephone system, is a phone system where many extensions share outside lines. The federal definition includes PBX, key and hybrid systems, Centrex and VoIP, whether on premises or hosted in the network. Hotels, senior living communities and offices typically run one.
What is a dispatchable location?
The FCC defines it as the validated street address of the caller plus additional information, such as suite, apartment or similar detail, needed to identify where the caller is. In a hotel, that means the building, floor and room.
When did the MLTS dispatchable location rules take effect?
Fixed devices on a multi-line system had to provide automated dispatchable location by January 6, 2021. Non-fixed devices on premises, and off-premises devices, had to comply by January 6, 2022, using automated location where technically feasible and allowed alternatives where it isn't.
How is RAY BAUM'S Act different from Kari's Law?
Kari's Law makes sure a 911 call gets through: direct dialing with no prefix, plus an on-site notification. RAY BAUM'S Act Section 506 makes sure responders know where the call came from by requiring a dispatchable location.
Regulatory details are from the FCC and 911.gov. Rules can change, so check the current text before making compliance decisions.