You need to import a list of phones into the Managed IP Phones container.

Use an existing .CSV file that you have available.

Create a spreadsheet with a list of the phones with a field for SIP phone name, template, extension and address information and specify the correct template name.

Create a managed IP phone template for the correct phone model.

Create a .CSV file in the correct format with a field for SIP phone name, template, extension and address information and specify the correct template name.