A Porting Authority Form or PAF is required when submitting a port through the @voice platform. You may decide not to submit it straight away, but it is always good practice to keep a copy of a signed copy for future reference.
A PAF is a form that authorises the current subscriber of the phone number/s to port the numbers over to you and the @voice platform. Should any dispute arise during the process of the port, or later down the line, you will need to have a signed PAF.
If you are the current subscriber of the phone numbers that you are intending to port, you can use the Porting Authority Form - Telecom (as attached in this document). If you have a customer that wants to port their numbers you can download the template and add in your Company Name and details (like logo, address, etc).