Version 6.2  615  February 2011 
SIP User's Manual   8. IP Telephony Capabilities 
 
  "GWAPP_IDENTIFIED_CHANNEL_NOT_EXIST"  
  "GWAPP_SUSPENDED_CALL_BUT_CALL_ID_NOT_EXIST"  
  "GWAPP_CALL_ID_IN_USE"  
  "GWAPP_NO_CALL_SUSPENDED"  
  "GWAPP_CALL_HAVING_CALL_ID_CLEARED"  
  "GWAPP_INCOMPATIBLE_DESTINATION"  
  "GWAPP_INVALID_TRANSIT_NETWORK_SELECTION"  
  "GWAPP_INVALID_MESSAGE_UNSPECIFIED"  
  "GWAPP_NOT_CUG_MEMBER"  
   "GWAPP_CUG_NON_EXISTENT"  
  "GWAPP_MANDATORY_IE_MISSING"  
  "GWAPP_MESSAGE_TYPE_NON_EXISTENT"  
  "GWAPP_MESSAGE_STATE_INCONSISTENCY"  
  "GWAPP_NON_EXISTENT_IE"  
  "GWAPP_INVALID_IE_CONTENT"  
  "GWAPP_MESSAGE_NOT_COMPATIBLE"  
  "GWAPP_RECOVERY_ON_TIMER_EXPIRY"  
  "GWAPP_PROTOCOL_ERROR_UNSPECIFIED"  
  "GWAPP_INTERWORKING_UNSPECIFIED"  
  "GWAPP_UKNOWN_ERROR"  
  "RELEASE_BECAUSE_HELD_TIMEOUT"