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Many people are giving up their traditional landline phone service at home and moving to Interconnected Voice over Internet Protocol (VoIP) phone service. VoIP allows you to make and receive calls to and from traditional phone numbers using a broadband internet connection.

Some users may not even realize that they no longer have landline phone service, because providers may simply call it "home phone service." VoIP service is attractive because it may be bundled with internet and TV for one price, and may offer free nationwide calling.

People should be aware that VoIP 9-1-1 service works differently than traditional landline 9‑1-1 service.

  • Caller address information may not display correctly at the 9-1-1 center for VoIP 9-1-1 calls. With landline phones, each address that is added to the 9-1-1 database is checked to make sure it fits with countywide addressing standards. With VoIP, the 9-1-1 center is unable to see what addresses people provided for their phone until they call 9-1-1. If the address is incorrect, they must be able to provide their correct address before help can be sent.
  • A VoIP 9-1-1 call may not go to the correct 9-1-1 center. If someone has provided an incorrect address for their phone, their 9-1-1 call could route to the wrong 9-1-1 center, causing the emergency response to be delayed while the correct address is determined and the call is transferred to the correct center. When the VoIP phone service can be moved to different locations and the owner doesn't update the address, the 9-1-1 call can even be routed to the wrong state or country.
  • VoIP phone service requires power, and may not work during a power outage. The battery on a VoIP phone may only last up to four hours, and then the phone will no longer work. During winter storms or disasters when people may need help, their phone may not work to call 9-1-1.
  • The VoIP phone may not be capable of placing a 9-1-1 call. Some VoIP services cannot call 9-1-1. The caller may receive a "service not available" recording. Programming a ten-digit number for a 9-1-1 center into the phone DOES NOT provide 9-1-1 service. Your call will be answered at a lower priority than 9-1-1 calls, and no information is provided, so you must be able to give your phone number and location before help can be sent.
  • A VoIP phone will look like any other telephone. Even if the phone's owner understands the 9-1-1 issue, visitors or others will expect the phone to provide them with access to 9-1-1 service when they call 9-1-1 in an emergency.

Read the fine print

Before you sign up for VoIP service, King County 9-1-1 encourages you to read all 9-1-1 information so you clearly understand the 9-1-1 capabilities of VoIP service.

When considering switching from traditional landline phone service to VoIP phone service, be an informed consumer. Anyone who is thinking about switching to VoIP needs to read the fine print and realize that the 9-1-1 service they have come to rely on may not work the same for this new phone service.

For information on FCC regulations and challenges of VoIP phones, visit the FCC website. For further questions about VoIP phones contact Marlys Davis, E-911 Program Manager.

Please use 9-1-1 responsibly. Call only if you need an emergency response from police, fire, or medics.
For non-emergencies, call your local police or fire department or other appropriate agency.

206-477-4910
CALL 9-1-1 IN AN EMERGENCY

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