Setup Astra 9133i Help

Been having issues setting up Astra 9133i phones. Have several for a home. Setting up manually as not an experienced FreePBX user yet. Can anyone give me some general setup info on these phones. FreePBX is, Phone is and systems are on a network with NAT router. Example password would be ‘secret22’ and example extension would be 705. Any assistance would be great. Tried many thinks and never seems to work. Same with my Grandstream 2000 phone too. My Yealink works like a charm and was very easy to setup.