Below is an example of Asterisk TRUNK configuration, when utilising Elastix PBX, when connecting to Servers Australia "VOIPNOW" solution.
The Configuration is valid when adding a SIP Trunk within the Basic -> Trunks configuration within Elastix.
In the below examples, <userid> stands for your extension number (example 10043850001), and <password> stands for the password configured on the extension.
Ensure you have "A PBX is connected to this extension" ticked within the "Provisioning and SIP" configuration.
USER Context: <userid>