While trying to access the sites XPhone Admin, UC Settings and XPhone Web a runtime error appears.
Check the following points:
1. ASP.NET v2.xx needs to be authorized in the Internet Information Service (IIS) under WEB SERVICE EXTENSION.
2. Under WEBSITE -> DEFAULT WEBSITE -> UCSETTINGS -> PROPERTIES, category "ASP.NET" under "ASP.NET version" the version 2.xx needs to be set.