I'm quite new to VOIP/SIP so forgive me if this is a n00b error.

I'm trying to get a Siemens C475 IP phone connected to an Epygi Quadro 2x VOIP device. I'm getting "Registration Failed".

These are my settings on the Epygi:


And these on the phone:


Not: The "Proxy Server" I've put down the IP address of the Epygi device. I've also tried moving it to the Registar field and also having it in both fields. No success.

I've tried refreshing the browser after applying settings (I read in another thread here that a Siemens device refreshes instantly and doesn't allow time for registration).