How to build a VoIP application for Windows Phone 7 that will not be blocked by the service providers

Mobile\WindowsPhone\01_Mobile2Web_voice\client\01_WP_Mobile2Web_Voice\Properties\AppManifest.xml
......\............\...................\......\......................\..........\AssemblyInfo.cs
......\............\...................\......\......................\..........\WMAppManifest.xml
......\............\...................\......\......................\01_WP_Mobile2Web_Voice.csproj
......\............\...................\......\......................\App.xaml
......\............\...................\......\......................\App.xaml.cs
......\............\...................\......\......................\ApplicationIcon.png
......\............\...................\......\......................\Background.png
......\............\...................\......\......................\MainPage.xaml
......\............\...................\......\......................\MainPage.xaml.cs
......\............\...................\......\......................\SplashScreenImage.jpg
......\............\...................\......\01_WP_Mobile2Web_Voice.sln
......\............\...................\server\WP_Mobile2Web_Voice_Server\Properties\AssemblyInfo.cs
......\............\...................\......\..........................\App.config
......\............\...................\......\..........................\Mobile2WebGateway.cs
......\............\...................\......\..........................\MyClient.cs
......\............\...................\......\..........................\Program.cs
......\............\...................\......\..........................\sdk_icon.ico
......\............\...................\......\..........................\WP_Mobile2Web_Voice_Server.csproj
......\............\...................\......\WP_Mobile2Web_Voice_Server.sln
SDK\FlashClientSDK.swc
...\VoIPSDK.pdb
...\VoIPSDK.xml

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