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3CX Phone System for Windows System for Windows
Page 9
3. In the section ‘Authentication’, select ‘SIP server / VOIP provider’ and enter the
Account (usually your VOIP provider number or Extension number) and your assigned
Authentication ID and Password.
4. If connecting to a VOIP provider or remote SIP server, click on the tab ‘STUN and
enable the option “Use STUN – Resolved Public IP Address’. Leave the default STUN
server or enter another one.
5. Now click Save to save the connection profile.
To switch to this connection from within the phone, select ‘Action > Connection >
Connection name’ from the menu. The connection will be re-established with the new
connection settings.