To configure a Comrex STAC-VIP system to use OnSIP, follow the steps below.
First, go to "Line Configuration" in the configuration interface.
Then click on "Add Provider".
Under "SIP Provider," choose "OnSIP".
In "Account Information", enter the OnSIP username in the "User Name" field. Also enter the OnSIP proxy in the "Proxy/Domain" field.
The authentication username is the OnSIP auth user.
Enter the OnSIP SIP Password in the "Account Password" field.
Save the settings and check in admin.onsip.com under the user (after refreshing the page) to see if there is a registration.