Systems and methods provide unified playing of announcements across different network interfaces. A system to extend an IMS SCIM to enable application servers using MSCML to play announcements to execute on WIN (CDMA) networks include an application server, including IMS applications. The system includes a SCIM to manage communication between call parties and the applications. In a CDMA network, which an open dialogue the SCIM is configured to respond to the IMS applications that then can play the announcement, receive a second message which indicates the announcement to play from the IMS applications, buffer the announcement indicated, and respond with a message to the IMS applications as if the announcements have been played.