# How to register a 911 address for each business phone line

Every Onyx Phone line needs a registered 911 address before it can make or take calls, so that emergency dispatchers are sent to the right place. This guide shows account admins how to open 911 setup, check where each line stands, choose the address where each line is used, and accept the 911 notice.

Works on: Web app. Updated November 6, 2026. Web page with labeled screenshots: https://www.onyxphone.io/guides/911-setup

## Before you start

- You need to be an account admin.

## Step 1. Open 911 setup and check each line

- Step 1.a: Click your initials at the top right of the screen, then click My account.
- Step 1.b: On the Compliance card, click View 911 setup.
- Step 1.c: Read Where each line stands. Each line shows its 911 address and status; 911 ready means calls work and a 911 call sends dispatchers to that address.

![The 911 setup page showing where each line stands, with each line's 911 address and its 911 ready status.](https://www.onyxphone.io/guides/shots/web-911-status.webp)

## Step 2. Choose where each line is used

- Step 2.a: Under Where each line is used, find each line.
- Step 2.b: Choose the business address, an address you've used before, or A new address, and type the street, city, state, and ZIP code.
- Step 2.c: Click Next →.

![The first step of 911 setup with the address choice for each line and the Next button.](https://www.onyxphone.io/guides/shots/web-911-addresses.webp)

## Step 3. Accept the 911 notice

- Step 3.a: Read the notice about how 911 works on internet calling, such as needing power and an internet connection.
- Step 3.b: Tick the box to accept it. Once an admin has accepted the current notice, the page says who accepted it and when instead.
- Step 3.c: Click Save and register. Lines usually start working within minutes, once the address is confirmed.

![The second step of 911 setup with the 911 notice, its checkbox, and the Save and register button.](https://www.onyxphone.io/guides/shots/web-911-notice.webp)

## Questions and answers

### Why does every line need a 911 address?

Internet phone numbers aren't tied to a building, so the law requires a registered address for each one. When someone calls 911 from a line, dispatchers are sent to its address.

### What if a line is used somewhere other than the office?

Choose A new address for that line and enter where it's actually used, such as a branch or someone's home office.

### What about desk phones in another building?

Each desk phone can have its own 911 location. See Desk phones.

### Does 911 work if the power or internet is out?

No. Calls need power and an internet or data connection, so keep another way to reach 911, such as a cell phone.

### What happens if I change the business address?

Every line that uses the business address is registered again at the new one.