SIP

I have a firewall, which ports need to be open to be able to use giants’ VoIP service?
You will need to make sure data being passed through the below ports in your firewall to be able to effectively use giants’ VoIP service(s).
Configuring the HT802 (ATA) Anologue to sip adaptor
In this guide we will go through configuring the HT802 in order to register to the Giant servers so that you will be able to place and receive calls using your Giant account.