diff --git a/src/CallHandler.tsx b/src/CallHandler.tsx
index 42a38c7a54..8621f441de 100644
--- a/src/CallHandler.tsx
+++ b/src/CallHandler.tsx
@@ -706,6 +706,14 @@ export default class CallHandler {
                         return;
                     }
 
+                    if (this.getCallForRoom(room.roomId)) {
+                        Modal.createTrackedDialog('Call Handler', 'Existing Call with user', ErrorDialog, {
+                            title: _t('Already in call'),
+                            description: _t("You're already in a call with this person."),
+                        });
+                        return;
+                    }
+
                     const members = room.getJoinedMembers();
                     if (members.length <= 1) {
                         Modal.createTrackedDialog('Call Handler', 'Cannot place call with self', ErrorDialog, {
diff --git a/src/i18n/strings/en_EN.json b/src/i18n/strings/en_EN.json
index fa7f446b7c..a1999acb3b 100644
--- a/src/i18n/strings/en_EN.json
+++ b/src/i18n/strings/en_EN.json
@@ -58,6 +58,8 @@
     "You cannot place VoIP calls in this browser.": "You cannot place VoIP calls in this browser.",
     "Too Many Calls": "Too Many Calls",
     "You've reached the maximum number of simultaneous calls.": "You've reached the maximum number of simultaneous calls.",
+    "Already in call": "Already in call",
+    "You're already in a call with this person.": "You're already in a call with this person.",
     "You cannot place a call with yourself.": "You cannot place a call with yourself.",
     "Call in Progress": "Call in Progress",
     "A call is currently being placed!": "A call is currently being placed!",