Manage SIP Link numbers

You can use SIP Link to connect Google Voice with a third-party vendor Session Border Controller (SBC). SBCs allow you to maintain service with a vendor and keep your phone hardware infrastructure in place, without interrupting Voice.

To use SIP Link, you need to add a SIP Link number, verify it, and then assign the number.

Add a SIP Link number to Voice

1. Sign in to your Google Admin console.

   Sign in using your administrator account (does not end in @gmail.com).

2. In the Admin console, go to Menu  AppsGoogle WorkspaceGoogle Voice.
3. Click SIP trunks.
4. Open the SIP trunk you want to add a number to.
5. Click Add Numbers.
6. Choose an option:
   • To create a list of numbers and users, click Start a new list and in the Google Sheets file, enter the managed numbers and the users they’ll be assigned to.
   • To upload an existing Sheets file that has the managed numbers and assigned users, click Use existing.
7. (Optional) To override a user’s existing number with a new number, check the If a user has an existing number, override it with a new number box.
8. Click Continue.
9. Click Add numbers.

At the top of the Admin console, you can review the progress and how long it will take until your numbers are added to your SIP trunk.

Assign a SIP Link number

1. Sign in to your Google Admin console.

   Sign in using your administrator account (does not end in @gmail.com).

2. In the Admin console, go to Menu  AppsGoogle WorkspaceGoogle Voice.
3. If you want to assign a number to users:
   1. Hover over the user you want to assign the number to and click Assign SIP trunk number.
   2. Select a SIP trunk.
   3. Click Select a number.
   4. In the next window, select a trunk number.
   5. Click Assign number.
4. If you want to assign a number to an auto attendant:
   1. Click Auto attendants.
   2. Click the auto attendant.
   3. On the left, click Assign a Number > Assign a SIP trunk number.
   4. Select a SIP Link.
   5. Click Select a number.
   6. In the next window, select a trunk number.
   7. Click Assign number.
5. If you want to assign a number to a ring group:
   1. Click Ring groups.
   2. Click the ring group.
   3. On the left, click Assign a Number > Assign a SIP trunk number.
   4. Select a SIP Link.
   5. Click Select a number.
   6. In the next window, select a trunk number.
6. Click Assign number.

Unassign a SIP Link number

1. Sign in to your Google Admin console.

   Sign in using your administrator account (does not end in @gmail.com).

2. In the Admin console, go to Menu  AppsGoogle WorkspaceGoogle Voice.
3. If you want to unassign a number to users:
   1. Click Users.
   2. Hover over the user and click Edit number.
   3. Click Unassign  Confirm.
4. If you want to unassign a number to an auto attendant.
   1. Click Auto Attendants.
   2. Select the auto attendant.
   3. Click More  Unassign  Unassign.
5. If you want to unassign a number to a ring groups.
   1. Click Ring Groups.
   2. Select the ring group.
   3. Click More  Unassign  Unassign.

Release numbers for SIP trunks

You can release numbers for SIP trunks directly.

1. Sign in to your Google Admin console.

   Sign in using your administrator account (does not end in @gmail.com).

2. In the Admin console, go to Menu  AppsGoogle WorkspaceGoogle Voice.
3. On the left, select SIP Trunks.
4. Select the SIP trunk to release numbers from.
5. Press Edit Numbers.
6. Check the boxes to select the numbers to release.
7. Press Release selected numbers.
8. Press Release numbers to confirm in the dialog.

Related topics

• Check SIP Link requirements
• Troubleshoot SIP Link setup