diff --git a/src/api_data/conversation_api.rs b/src/api_data/conversation_api.rs
index 37afce5..2705d07 100644
--- a/src/api_data/conversation_api.rs
+++ b/src/api_data/conversation_api.rs
@@ -5,6 +5,7 @@ use serde::{Serialize, Serializer};
 
 use crate::api_data::legacy_api_bool::LegacyBool;
 use crate::data::conversation::Conversation;
+use crate::helpers::calls_helper;
 
 /// Special implementation of conversation name (false if none / the name otherwise)
 struct ConvName(Option<String>);
@@ -48,9 +49,9 @@ impl ConversationAPI {
             members: conv.members.iter().map(|x| x.id()).collect(),
             canEveryoneAddMembers: conv.can_everyone_add_members,
 
+            can_have_call: calls_helper::can_have_call(conv),
+            can_have_video_call: calls_helper::can_have_video_calls(conv),
             // TODO : update when call system is implemented
-            can_have_call: false,
-            can_have_video_call: false,
             has_call_now: false,
         }
     }
diff --git a/src/controllers/rtc_relay_controller.rs b/src/controllers/rtc_relay_controller.rs
index 39e0ed8..72c0fbd 100644
--- a/src/controllers/rtc_relay_controller.rs
+++ b/src/controllers/rtc_relay_controller.rs
@@ -99,6 +99,15 @@ fn get_active_connection() -> Option<Addr<RtcRelayActor>> {
     conn
 }
 
+/// Check out whether a relay is currently connected to the API or not
+pub fn is_connected() -> bool {
+    if let Some(conn) = get_active_connection() {
+        return conn.connected();
+    }
+
+    false
+}
+
 /// Establish a new connection with the RTC relay
 ///
 /// Debug with
diff --git a/src/helpers/calls_helper.rs b/src/helpers/calls_helper.rs
new file mode 100644
index 0000000..7e5eedd
--- /dev/null
+++ b/src/helpers/calls_helper.rs
@@ -0,0 +1,29 @@
+//! # Calls helper
+//!
+//! @author Pierre Hubert
+
+use crate::controllers::rtc_relay_controller;
+use crate::data::config::conf;
+use crate::data::conversation::Conversation;
+
+/// Check out whether a conversation can make a call or not
+pub fn can_have_call(conv: &Conversation) -> bool {
+    if let Some(conf) = &conf().rtc_relay {
+        return conv.members.len() > 1
+            && conf.max_users_per_calls >= conv.members.len() as u64
+            && rtc_relay_controller::is_connected();
+    }
+
+    false
+}
+
+/// Check out whether a conversation is allowed to make video calls or not
+pub fn can_have_video_calls(conv: &Conversation) -> bool {
+    if let Some(conf) = &conf().rtc_relay {
+        return can_have_call(conv)
+            && conf.allow_video
+            && conf.max_users_per_video_calls >= conv.members.len() as u64;
+    }
+
+    false
+}
\ No newline at end of file
diff --git a/src/helpers/mod.rs b/src/helpers/mod.rs
index f78db4c..683f516 100644
--- a/src/helpers/mod.rs
+++ b/src/helpers/mod.rs
@@ -17,4 +17,5 @@ pub mod comments_helper;
 pub mod notifications_helper;
 pub mod webapp_helper;
 pub mod requests_limit_helper;
-pub mod events_helper;
\ No newline at end of file
+pub mod events_helper;
+pub mod calls_helper;
\ No newline at end of file