Grandstream HT502 or HT286 ATA adapter
The Grandstream HT502 and HT286 adapters act as an analog adapter to connect your analog telephone to the Protel PBX, or other SIP PBX. The ATA adapter may also be used to connect a business class 1 or 2 line telephone to the PBX, such as the analog offerings from Aastra. If configuring a 2 line phone, you will require the use of the HT502 device since the HT286 is a single line device. Using this is recommended for customers who do not have network cabling in certain areas of a facility and only has CAT3 wiring to the location.
The provisioning explained here will explain how to do the configuration as we found as the easiest method to do so. You will require an analog telephone to complete step 1 of the installation process to change some settings on the telephone device.
As you can see, you have two FXS ports on the back of the unit. This allows you to have a 2 line telephone(s) or also using them to connect it to a legacy telephone system if needed. Of course you may also be using one only or using the ports for two analog telephones.
Getting Started Basics