Converged Application Server is fully compliant with the latest 3GPP Release 12 specification, and does not impose any restrictions on implementing applications or functions that are compliant with those associated with the Application Server entity described in the specification. In some cases, applications must implement support for SIP methods or headers. The default behavior of the Converged Application Server Sip Servlet Container is to pass unrecognized headers, request methods and payloads to SIP Servlets using normal SIP Servlet API procedures.