Users that only need to dial extensions and/or 911 for emergencies
In the OnSIP Admin Portal, take these steps in the User tab: 

1. Click User to expand boxes
2. Outbound Call Preference (right side) > modify >uncheck Outgoing PSTN calls > save

Users configured in this manner can now only dial extensions and 911.

Disabling User:
A disabled user can not do anything.

1. They can not make calls, their devices are no longer registered
2. Their SIP Password is changed, per security protocol
3. They can not log into the OnSIP app (any version)

To disable a User, in the OnSIP Admin Portal, take these steps in the User tab:

1. Click User to expand boxes
2. Disable User > lower right in small print (this keeps you from accidentally clicking it)
3. If you accidentally disabled a User, you can re-enable them, but you will need to:
   • Restart the phone (if configured to the boot server)
   • Log out/back into the OnSIP app
   • Manually configured phones will need the SIP Password updated.