Has anyone tried using a Granstream GXP-2020 with the 3CX as a remote extension? I know the GXP-2000's work as remotes. How about the 2020's? Just looking for some opinions. Today, I decided to return my Polycom 650's. It was absolute hell trying to get them to work right as remote extensions. Besides all of the other problems, the thing that killed their long term viability was the fact that you have to hard code the WAN IP into the config files. That's not going to work if the phone gets moved or the dynamic WAN IP changes.