...
Choose a existing modem and open the Edit-Page. On the right side click on the Plus-Button under "Assigned MTAs" for creating a new MTA.
Fill out all the required fields to create a new MTA.
Next Add a Phonenumber
...
Choose a existing modem and open the Edit-Page. On the right side click on the Plus-Button under "Assigned MTAs" for creating a new MTA.
Fill out all the required fields to create a new MTA.
Next Add a Phonenumber