Once an auto-attendant has been    activated, whether or not a phone number has been assigned yet, it can no longer be edited. This is because the Auto-Attendant route builder saves changes in real time, and we don't want you to accidentally break an active call flow, even temporarily.

If you just want to take a look at how the auto-attendant is set up, click  to open it in View Only mode. But if you do need to make changes, you have a few options:

Option 1: Duplicate, Edit, Switch

1. In the Voice Portal, go to the Auto-Attendant page. Locate the one you want to modify and click  Duplicate.
2. Click  Edit to open the builder and make any necessary changes.
3. Go back to the Auto-Attendant page, find the one you just modified, and click  Activate.
4. When you're ready for the new version to go live, go to the Phone Numbers page and locate the phone number assigned to the original auto-attendant.
5. Click the destination on the right and change it to the new auto-attendant. Calls to that phone number will now be directed through the new auto-attendant.
6. Go to the Auto-Attendant page, locate the original, and click  Deactivate.
7. Delete the old version or rename it so users don't confuse them.

Option 2: Deactivate, Edit, Reactivate

To avoid breaking an active call flow, make these changes after-hours when you're sure calls aren't coming in for as long as it will take to make changes.

1. In the Admin Portal, go to the Phone Numbers page and locate the phone number assigned to the auto-attendant you want to modify.
2. Click the phone number destination on the right and change it to "None" or another viable option (like a temporary auto-attendant).
3. Go to the Auto-Attendant page and locate the one you want to modify. Click  Deactivate.
4. Now click  Edit to open the builder and make any necessary changes.
5. When you're done, go back to the Auto-Attendant page, locate the auto-attendant you just modified, and click  Activate.
6. Click the Assign Phone Number link to go to the Phone Numbers page.
7. Locate the phone number you want to assign, then click the destination on the right and change it back to the auto-attendant.
8. Click [Save]. Calls to that phone number will now be directed through the auto-attendant.