Unlike some SIP Trunk services, MyNetFone does not use username/password based authentication for its SIP Trunks, authentication is done using certain fields within SIP packets such as the public IP. This is a much more secure method to authenticate as calls can only be made from a specific IP address.

For a standard SIP Trunk - https://www.mynetfone.com.au/media/support/MNF_SIP_Trunk_Authentication.pdf

For Microsoft Lync - https://www.mynetfone.com.au/media/support/MNF_SIP_Trunk_with_Microsoft_Lync_Authentication.pdf

If you require username / password authentication, please contact Business Sales on 1300 733 995