diff --git a/app/src/main/java/org/linphone/activities/main/chat/viewmodels/ChatRoomsListViewModel.kt b/app/src/main/java/org/linphone/activities/main/chat/viewmodels/ChatRoomsListViewModel.kt
index be15d21ef..d8e95f27f 100644
--- a/app/src/main/java/org/linphone/activities/main/chat/viewmodels/ChatRoomsListViewModel.kt
+++ b/app/src/main/java/org/linphone/activities/main/chat/viewmodels/ChatRoomsListViewModel.kt
@@ -89,7 +89,7 @@ class ChatRoomsListViewModel : MessageNotifierViewModel() {
     }
 
     private val contactsListener = object : ContactsUpdatedListenerStub() {
-        override fun onContactUpdated(friend: Friend) {
+        override fun onContactsUpdated() {
             updateChatRooms()
         }
     }
diff --git a/app/src/main/java/org/linphone/activities/main/conference/data/ScheduledConferenceData.kt b/app/src/main/java/org/linphone/activities/main/conference/data/ScheduledConferenceData.kt
index 63f69af1d..78294e863 100644
--- a/app/src/main/java/org/linphone/activities/main/conference/data/ScheduledConferenceData.kt
+++ b/app/src/main/java/org/linphone/activities/main/conference/data/ScheduledConferenceData.kt
@@ -24,6 +24,7 @@ import java.util.concurrent.TimeUnit
 import org.linphone.LinphoneApplication.Companion.coreContext
 import org.linphone.R
 import org.linphone.core.ConferenceInfo
+import org.linphone.core.ConferenceInfoState
 import org.linphone.core.tools.Log
 import org.linphone.utils.LinphoneUtils
 import org.linphone.utils.TimestampUtils
@@ -43,6 +44,7 @@ class ScheduledConferenceData(val conferenceInfo: ConferenceInfo, private val is
     val participantsShort = MutableLiveData<String>()
     val participantsExpanded = MutableLiveData<String>()
     val showDuration = MutableLiveData<Boolean>()
+    val isConferenceCancelled = MutableLiveData<Boolean>()
 
     init {
         expanded.value = false
@@ -53,6 +55,7 @@ class ScheduledConferenceData(val conferenceInfo: ConferenceInfo, private val is
 
         time.value = TimestampUtils.timeToString(conferenceInfo.dateTime)
         date.value = TimestampUtils.toString(conferenceInfo.dateTime, onlyDate = true, shortDate = false, hideYear = false)
+        isConferenceCancelled.value = conferenceInfo.state == ConferenceInfoState.Cancelled
 
         val minutes = conferenceInfo.duration
         val hours = TimeUnit.MINUTES.toHours(minutes.toLong())
diff --git a/app/src/main/res/drawable/button_green_background.xml b/app/src/main/res/drawable/button_green_background.xml
index 1ebc96355..8d4cfbb68 100644
--- a/app/src/main/res/drawable/button_green_background.xml
+++ b/app/src/main/res/drawable/button_green_background.xml
@@ -2,6 +2,8 @@
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:state_pressed="true"
         android:drawable="@drawable/shape_rect_orange_button" />
+    <item android:state_enabled="false"
+        android:drawable="@drawable/shape_rect_gray_button" />
     <item
         android:drawable="@drawable/shape_rect_green_button" />
 </selector>
diff --git a/app/src/main/res/layout/chat_message_conference_invitation_content_cell.xml b/app/src/main/res/layout/chat_message_conference_invitation_content_cell.xml
index 2b8df0a22..26ce5b86f 100644
--- a/app/src/main/res/layout/chat_message_conference_invitation_content_cell.xml
+++ b/app/src/main/res/layout/chat_message_conference_invitation_content_cell.xml
@@ -124,6 +124,7 @@
                 android:layout_gravity="center_vertical|end"
                 android:layout_marginTop="10dp"
                 android:background="@drawable/button_green_background"
+                android:enabled="@{data.isOutgoing || !data.isConferenceCancelled}"
                 android:onClick="@{() -> data.callConferenceAddress()}"
                 android:paddingLeft="20dp"
                 android:paddingTop="8dp"
diff --git a/app/src/main/res/layout/conference_schedule_cell.xml b/app/src/main/res/layout/conference_schedule_cell.xml
index d72b0d3ef..eec84fece 100644
--- a/app/src/main/res/layout/conference_schedule_cell.xml
+++ b/app/src/main/res/layout/conference_schedule_cell.xml
@@ -248,6 +248,7 @@
                         android:layout_width="wrap_content"
                         android:layout_height="wrap_content"
                         android:background="@drawable/button_green_background"
+                        android:enabled="@{!data.isConferenceCancelled}"
                         android:paddingLeft="20dp"
                         android:paddingTop="8dp"
                         android:paddingRight="20dp"