I want to use UCMA 3.0 (standalone, without Lync) to create an IVR application as modeled in the SDK docs:
http://msdn.microsoft.com/en-us/library/gg448007.aspx
I'd like a code snippet that demonstrates how to create the endpoint to a SIP PSTN Gateway so people can dial in from a regular phone and the app will pick up. I have the user name, password, and domain from the SIP provider. I could not find in any of the samples an actual code example of the model described in the link above.
Actually, the Visual Studio template included with UCMA already handles this (albeit in an ultra confusing way). If you create a new project and hit F5 it will start a standalone application listening on port 5060.
What it doesn't handle is SIP registration. For that you'll need to put a proxy server between your app and your provider. Check out http://www.brekeke.com/sip/, they offer a low-cost SIP server that can register against your SIP provider.