Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
Look towards Europe, where IPv6-only internet service is not uncommon.
https://teamhelp.sipgate.co.uk/hc/en-gb/articles/207403895-sipgate-IP-Port-Ranges
https://www.dus.net/en/sip-default-settings
https://en.easybell.de/help/telephone-configuration/general/voip-expert-settings/