Yes MS SQL also requires a login, unless you are using an ODBC, which stores the login.
It should not be difficult to configure a data source, similar to the way any website stores a data source.
<!-- Connection String for SQL Server 2000/2005
<add name="SiteSqlServer" connectionString="Server=(local);Database=PBXnSIP;uid=;pwd=;" providerName="System.Data.SqlClient" />
If you can't do this, then we will need to create a simple webpage to capture your soap traffic, and store in a SQL database.