diff --git a/src/com/savoirfairelinux/sflphone/service/ISipService.aidl b/src/com/savoirfairelinux/sflphone/service/ISipService.aidl
index 3a79892..4d99e42 100644
--- a/src/com/savoirfairelinux/sflphone/service/ISipService.aidl
+++ b/src/com/savoirfairelinux/sflphone/service/ISipService.aidl
@@ -55,6 +55,7 @@
     void hangUpConference(in String confID);
     void holdConference(in String confID);
     void unholdConference(in String confID);
+    boolean isConferenceParticipant(in String callID);
     Map getConferenceList();
     Map getCallList();
     List getParticipantList(in String confID);