We are using the ip4000. Works well but we needed to upgrade firmware to work with our 3cx server because we are using dual nic's as a team. The phone reported ip conflicts until we upgraded.
Sorry I can't answer that. Our primary phones here are Aastra model 9133i. I got the ip4000 out of the box and put in the gateway info and it worked from day one. Good product. Good sound quality.