Credits to Val, thank you for your help.
The attached PDF will help you set up your SPA122 device from scratch. It is a known working configuration so if you are having troubles with your SPA122 reset back to defaults and follow this guide.
Edit: Navigate to Voice-->SIP-->SIP Timer Values (sec)-->Reg Retry Intvl should be 120 seconds
https://support.freephoneline.ca/hc/en- ... redentials
Then do what Mango wrote below.