When setting up my Obi1062, can I simply use the web GUI for the device on my local network or do I have to create an ObiTalk account? I will be configuring the Obi1062 to work with my Asterisk Server.
Yes, you can use the device's local configuration methods. Either via its own screen and buttons or a browser pointed at its on-board web server. You don't need an Obitalk account. You don't need to register the device on the portal.