diff -r 2fa1fa551b0b -r 78df25012fda satengine/satserver/inc/msatmultimodeapi.h
--- a/satengine/satserver/inc/msatmultimodeapi.h	Fri Sep 03 13:59:20 2010 +0300
+++ b/satengine/satserver/inc/msatmultimodeapi.h	Fri Sep 17 17:09:13 2010 +0300
@@ -166,6 +166,15 @@
     virtual void DialEmergencyCall(TRequestStatus& aReqStatus, 
                 const TDesC& aNumber) = 0;
     
+
+    /**
+     * Check validity of a given Data Coding Cheme (Dcs).
+     * used by call control handler and send ussd handler
+     * @param aDcs Data Coding Cheme to be validated.
+     * @return TBool indicating Dcs validity.
+     */
+    virtual TBool IsValidUssdDcs( const TUint8 aDcs ) = 0;
+    
     };
 
 #endif // MSATMULTIMODEAPI_H