diff --git a/td/generate/scheme/td_api.tl b/td/generate/scheme/td_api.tl
index 5bb571e9a..617559daa 100644
--- a/td/generate/scheme/td_api.tl
+++ b/td/generate/scheme/td_api.tl
@@ -4324,6 +4324,9 @@ toggleGroupCallMuteNewMembers group_call_id:string mute_new_members:Bool = Ok;
 //@group_call_id Group call identifier @user_id User identifier
 inviteGroupCallMember group_call_id:string user_id:int32 = Ok;
 
+//@description Checks group call source for validness. If the method returns an error with a message "GROUP_CALL_JOIN_MISSING", the call needs to be rejoined @group_call_id Group call identifier @source Caller source identifier
+checkGroupCallSource group_call_id:string source:int32 = Ok;
+
 //@description Leaves a group call @group_call_id Group call identifier @source Caller source identifier
 leaveGroupCall group_call_id:string source:int32 = Ok;
 
diff --git a/td/generate/scheme/td_api.tlo b/td/generate/scheme/td_api.tlo
index c728ab362..0c818aaaa 100644
Binary files a/td/generate/scheme/td_api.tlo and b/td/generate/scheme/td_api.tlo differ
diff --git a/td/telegram/GroupCallManager.cpp b/td/telegram/GroupCallManager.cpp
index 766a0a4b5..7497a3fe7 100644
--- a/td/telegram/GroupCallManager.cpp
+++ b/td/telegram/GroupCallManager.cpp
@@ -168,6 +168,39 @@ class InviteToGroupCallQuery : public Td::ResultHandler {
   }
 };
 
+class CheckGroupCallQuery : public Td::ResultHandler {
+  Promise<Unit> promise_;
+
+ public:
+  explicit CheckGroupCallQuery(Promise<Unit> &&promise) : promise_(std::move(promise)) {
+  }
+
+  void send(InputGroupCallId group_call_id, int32 source) {
+    send_query(G()->net_query_creator().create(
+        telegram_api::phone_checkGroupCall(group_call_id.get_input_group_call(), source)));
+  }
+
+  void on_result(uint64 id, BufferSlice packet) override {
+    auto result_ptr = fetch_result<telegram_api::phone_checkGroupCall>(packet);
+    if (result_ptr.is_error()) {
+      return on_error(id, result_ptr.move_as_error());
+    }
+
+    bool success = result_ptr.move_as_ok();
+    LOG(INFO) << "Receive result for CheckGroupCallQuery: " << success;
+
+    if (success) {
+      promise_.set_value(Unit());
+    } else {
+      promise_.set_error(Status::Error(200, "Group call left"));
+    }
+  }
+
+  void on_error(uint64 id, Status status) override {
+    promise_.set_error(std::move(status));
+  }
+};
+
 class LeaveGroupCallQuery : public Td::ResultHandler {
   Promise<Unit> promise_;
 
@@ -447,6 +480,10 @@ void GroupCallManager::invite_group_call_member(InputGroupCallId group_call_id,
   td_->create_handler<InviteToGroupCallQuery>(std::move(promise))->send(group_call_id, user_id);
 }
 
+void GroupCallManager::check_group_call_source(InputGroupCallId group_call_id, int32 source, Promise<Unit> &&promise) {
+  td_->create_handler<CheckGroupCallQuery>(std::move(promise))->send(group_call_id, source);
+}
+
 void GroupCallManager::leave_group_call(InputGroupCallId group_call_id, int32 source, Promise<Unit> &&promise) {
   td_->create_handler<LeaveGroupCallQuery>(std::move(promise))->send(group_call_id, source);
 }
diff --git a/td/telegram/GroupCallManager.h b/td/telegram/GroupCallManager.h
index f47fed8ce..5669e1723 100644
--- a/td/telegram/GroupCallManager.h
+++ b/td/telegram/GroupCallManager.h
@@ -41,6 +41,8 @@ class GroupCallManager : public Actor {
 
   void invite_group_call_member(InputGroupCallId group_call_id, UserId user_id, Promise<Unit> &&promise);
 
+  void check_group_call_source(InputGroupCallId group_call_id, int32 source, Promise<Unit> &&promise);
+
   void leave_group_call(InputGroupCallId group_call_id, int32 source, Promise<Unit> &&promise);
 
   void discard_group_call(InputGroupCallId group_call_id, Promise<Unit> &&promise);
diff --git a/td/telegram/Td.cpp b/td/telegram/Td.cpp
index 7c0b78539..24a411c93 100644
--- a/td/telegram/Td.cpp
+++ b/td/telegram/Td.cpp
@@ -6066,6 +6066,14 @@ void Td::on_request(uint64 id, const td_api::inviteGroupCallMember &request) {
   group_call_manager_->invite_group_call_member(group_call_id, UserId(request.user_id_), std::move(promise));
 }
 
+void Td::on_request(uint64 id, const td_api::checkGroupCallSource &request) {
+  CHECK_IS_USER();
+  CREATE_OK_REQUEST_PROMISE();
+  TRY_RESULT_PROMISE(promise, group_call_id, InputGroupCallId::from_group_call_id(request.group_call_id_));
+
+  group_call_manager_->check_group_call_source(group_call_id, request.source_, std::move(promise));
+}
+
 void Td::on_request(uint64 id, const td_api::leaveGroupCall &request) {
   CHECK_IS_USER();
   CREATE_OK_REQUEST_PROMISE();
diff --git a/td/telegram/Td.h b/td/telegram/Td.h
index b1479bb18..c711c0201 100644
--- a/td/telegram/Td.h
+++ b/td/telegram/Td.h
@@ -700,6 +700,8 @@ class Td final : public NetQueryCallback {
 
   void on_request(uint64 id, const td_api::inviteGroupCallMember &request);
 
+  void on_request(uint64 id, const td_api::checkGroupCallSource &request);
+
   void on_request(uint64 id, const td_api::leaveGroupCall &request);
 
   void on_request(uint64 id, const td_api::discardGroupCall &request);
diff --git a/td/telegram/cli.cpp b/td/telegram/cli.cpp
index 5a47f09a0..a9adad591 100644
--- a/td/telegram/cli.cpp
+++ b/td/telegram/cli.cpp
@@ -2857,6 +2857,8 @@ class CliClient final : public Actor {
       std::tie(group_call_id, user_id) = split(args);
       send_request(
           td_api::make_object<td_api::inviteGroupCallMember>(as_group_call_id(group_call_id), as_user_id(user_id)));
+    } else if (op == "cgcs") {
+      send_request(td_api::make_object<td_api::checkGroupCallSource>(as_group_call_id(args), 123));
     } else if (op == "lgc") {
       send_request(td_api::make_object<td_api::leaveGroupCall>(as_group_call_id(args), 123));
     } else if (op == "dgc") {