Sipgate’s own software phone doesn’t work on Windows 7 so I had to find an alternative and chose 3CXPhone.
It’s taken a little time to get it to connect to my Sipgate account so here is the configuration I used to get it to work:

Account name and Caller ID can be anything you like.
Change “Extension” and “ID” to your Sipgate ID.
You also need to set the STUN server by clicking on “Advanced Settings” from the Configuration window:

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