diff --git a/td/generate/scheme/td_api.tl b/td/generate/scheme/td_api.tl
index d53228e2b..4b357bbe9 100644
--- a/td/generate/scheme/td_api.tl
+++ b/td/generate/scheme/td_api.tl
@@ -571,13 +571,14 @@ basicGroupFullInfo photo:chatPhoto description:string creator_user_id:int32 memb
 //@has_linked_chat True, if the channel has a discussion group, or the supergroup is the designated discussion group for a channel
 //@has_location True, if the supergroup is connected to a location, i.e. the supergroup is a location-based supergroup
 //@has_voice_chat True, if the supergroup has active voice chat
+//@is_voice_chat_empty True, if the supergroup's active voice chat is empty
 //@sign_messages True, if messages sent to the channel should contain information about the sender. This field is only applicable to channels
 //@is_slow_mode_enabled True, if the slow mode is enabled in the supergroup
 //@is_channel True, if the supergroup is a channel
 //@is_verified True, if the supergroup or channel is verified
 //@restriction_reason If non-empty, contains a human-readable description of the reason why access to this supergroup or channel must be restricted
 //@is_scam True, if many users reported this supergroup as a scam
-supergroup id:int32 username:string date:int32 status:ChatMemberStatus member_count:int32 has_linked_chat:Bool has_location:Bool has_voice_chat:Bool sign_messages:Bool is_slow_mode_enabled:Bool is_channel:Bool is_verified:Bool restriction_reason:string is_scam:Bool = Supergroup;
+supergroup id:int32 username:string date:int32 status:ChatMemberStatus member_count:int32 has_linked_chat:Bool has_location:Bool has_voice_chat:Bool is_voice_chat_empty:Bool sign_messages:Bool is_slow_mode_enabled:Bool is_channel:Bool is_verified:Bool restriction_reason:string is_scam:Bool = Supergroup;
 
 //@description Contains full information about a supergroup or channel
 //@photo Chat photo; may be null
@@ -4200,8 +4201,8 @@ leaveChat chat_id:int53 = Ok;
 //@chat_id Chat identifier @user_id Identifier of the user @forward_limit The number of earlier messages from the chat to be forwarded to the new member; up to 100. Ignored for supergroups and channels
 addChatMember chat_id:int53 user_id:int32 forward_limit:int32 = Ok;
 
-//@description Adds multiple new members to a chat. Currently this option is only available for supergroups and channels. This option can't be used to join a chat. Members can't be added to a channel if it has more than 200 members. Members will not be added until the chat state has been synchronized with the server
-//@chat_id Chat identifier @user_ids Identifiers of the users to be added to the chat
+//@description Adds multiple new members to a chat. Currently this method is only available for supergroups and channels. This method can't be used to join a chat. Members can't be added to a channel if it has more than 200 members. Members will not be added until the chat state has been synchronized with the server
+//@chat_id Chat identifier @user_ids Identifiers of the users to be added to the chat. The maximum number of added users is 20 for supergroups and 100 for channels
 addChatMembers chat_id:int53 user_ids:vector<int32> = Ok;
 
 //@description Changes the status of a chat member, needs appropriate privileges. This function is currently not suitable for adding new members to the chat and transferring chat ownership; instead, use addChatMember or transferChatOwnership. The chat member status will not be changed until it has been synchronized with the server
@@ -4341,7 +4342,7 @@ joinGroupCall group_call_id:int32 payload:groupCallPayload source:int32 is_muted
 toggleGroupCallMuteNewMembers group_call_id:int32 mute_new_members:Bool = Ok;
 
 //@description Invites users to a group call. Sends a service message of type messageInviteToGroupCall for voice chats
-//@group_call_id Group call identifier @user_ids User identifiers
+//@group_call_id Group call identifier @user_ids User identifiers. At most 10 users can be invited simultaneously
 inviteGroupCallMembers group_call_id:int32 user_ids:vector<int32> = Ok;
 
 //@description Informs TDLib that a group call member speaking state has changed @group_call_id Group call identifier
diff --git a/td/generate/scheme/td_api.tlo b/td/generate/scheme/td_api.tlo
index f0041a910..9c5118e63 100644
Binary files a/td/generate/scheme/td_api.tlo and b/td/generate/scheme/td_api.tlo differ
diff --git a/td/generate/scheme/telegram_api.tl b/td/generate/scheme/telegram_api.tl
index f75c5da86..0e3bd8875 100644
--- a/td/generate/scheme/telegram_api.tl
+++ b/td/generate/scheme/telegram_api.tl
@@ -111,7 +111,7 @@ userStatusLastMonth#77ebc742 = UserStatus;
 chatEmpty#9ba2d800 id:int = Chat;
 chat#3bda1bde flags:# creator:flags.0?true kicked:flags.1?true left:flags.2?true deactivated:flags.5?true id:int title:string photo:ChatPhoto participants_count:int date:int version:int migrated_to:flags.6?InputChannel admin_rights:flags.14?ChatAdminRights default_banned_rights:flags.18?ChatBannedRights = Chat;
 chatForbidden#7328bdb id:int title:string = Chat;
-channel#d31a961e flags:# creator:flags.0?true left:flags.2?true broadcast:flags.5?true verified:flags.7?true megagroup:flags.8?true restricted:flags.9?true signatures:flags.11?true min:flags.12?true scam:flags.19?true has_link:flags.20?true has_geo:flags.21?true slowmode_enabled:flags.22?true call_active:flags.23?true id:int access_hash:flags.13?long title:string username:flags.6?string photo:ChatPhoto date:int version:int restriction_reason:flags.9?Vector<RestrictionReason> admin_rights:flags.14?ChatAdminRights banned_rights:flags.15?ChatBannedRights default_banned_rights:flags.18?ChatBannedRights participants_count:flags.17?int = Chat;
+channel#d31a961e flags:# creator:flags.0?true left:flags.2?true broadcast:flags.5?true verified:flags.7?true megagroup:flags.8?true restricted:flags.9?true signatures:flags.11?true min:flags.12?true scam:flags.19?true has_link:flags.20?true has_geo:flags.21?true slowmode_enabled:flags.22?true call_active:flags.23?true call_not_empty:flags.24?true id:int access_hash:flags.13?long title:string username:flags.6?string photo:ChatPhoto date:int version:int restriction_reason:flags.9?Vector<RestrictionReason> admin_rights:flags.14?ChatAdminRights banned_rights:flags.15?ChatBannedRights default_banned_rights:flags.18?ChatBannedRights participants_count:flags.17?int = Chat;
 channelForbidden#289da732 flags:# broadcast:flags.5?true megagroup:flags.8?true id:int access_hash:long title:string until_date:flags.16?int = Chat;
 
 chatFull#1b7c9db3 flags:# can_set_username:flags.7?true has_scheduled:flags.8?true id:int about:string participants:ChatParticipants chat_photo:flags.2?Photo notify_settings:PeerNotifySettings exported_invite:ExportedChatInvite bot_info:flags.3?Vector<BotInfo> pinned_msg_id:flags.6?int folder_id:flags.11?int = ChatFull;
diff --git a/td/generate/scheme/telegram_api.tlo b/td/generate/scheme/telegram_api.tlo
index 524a4537f..f27e58ff0 100644
Binary files a/td/generate/scheme/telegram_api.tlo and b/td/generate/scheme/telegram_api.tlo differ
diff --git a/td/telegram/ContactsManager.cpp b/td/telegram/ContactsManager.cpp
index 69c48b245..3119f5df1 100644
--- a/td/telegram/ContactsManager.cpp
+++ b/td/telegram/ContactsManager.cpp
@@ -3561,6 +3561,7 @@ void ContactsManager::Channel::store(StorerT &storer) const {
   STORE_FLAG(is_slow_mode_enabled);
   STORE_FLAG(has_restriction_reasons);
   STORE_FLAG(has_active_group_call);
+  STORE_FLAG(is_group_call_empty);
   END_STORE_FLAGS();
 
   store(status, storer);
@@ -3627,6 +3628,7 @@ void ContactsManager::Channel::parse(ParserT &parser) {
   PARSE_FLAG(is_slow_mode_enabled);
   PARSE_FLAG(has_restriction_reasons);
   PARSE_FLAG(has_active_group_call);
+  PARSE_FLAG(is_group_call_empty);
   END_PARSE_FLAGS();
 
   if (use_new_rights) {
@@ -5963,6 +5965,7 @@ void ContactsManager::on_create_channel_group_call(ChannelId channel_id, InputGr
   CHECK(c != nullptr);
   if (!c->has_active_group_call) {
     c->has_active_group_call = true;
+    c->is_group_call_empty = true;
     c->is_changed = true;
     update_channel(c, channel_id);
   }
@@ -9664,6 +9667,9 @@ void ContactsManager::on_get_chat_full(tl_object_ptr<telegram_api::ChatFull> &&c
         LOG(ERROR) << "Receive invalid has_active_group_call flag " << c->has_active_group_call << ", but have "
                    << input_group_call_id << " in " << channel_id;
         c->has_active_group_call = has_active_group_call;
+        if (!has_active_group_call) {
+          c->is_group_call_empty = false;
+        }
         c->is_changed = true;
         update_channel(c, channel_id);
       }
@@ -13930,6 +13936,7 @@ void ContactsManager::on_chat_update(telegram_api::channel &channel, const char
   bool has_linked_channel = (channel.flags_ & CHANNEL_FLAG_HAS_LINKED_CHAT) != 0;
   bool has_location = (channel.flags_ & CHANNEL_FLAG_HAS_LOCATION) != 0;
   bool has_active_group_call = (channel.flags_ & CHANNEL_FLAG_HAS_ACTIVE_GROUP_CALL) != 0;
+  bool is_group_call_empty = (channel.flags_ & CHANNEL_FLAG_IS_GROUP_CALL_EMPTY) != 0;
   bool sign_messages = (channel.flags_ & CHANNEL_FLAG_SIGN_MESSAGES) != 0;
   bool is_slow_mode_enabled = (channel.flags_ & CHANNEL_FLAG_IS_SLOW_MODE_ENABLED) != 0;
   bool is_megagroup = (channel.flags_ & CHANNEL_FLAG_IS_MEGAGROUP) != 0;
@@ -14035,22 +14042,27 @@ void ContactsManager::on_chat_update(telegram_api::channel &channel, const char
   bool need_invalidate_channel_full = false;
   bool need_drop_active_group_call_id = c->has_active_group_call != has_active_group_call;
   if (c->has_linked_channel != has_linked_channel || c->has_location != has_location ||
-      c->has_active_group_call != has_active_group_call || c->sign_messages != sign_messages ||
-      c->is_megagroup != is_megagroup || c->is_verified != is_verified ||
+      c->has_active_group_call != has_active_group_call || c->is_megagroup != is_megagroup ||
       c->restriction_reasons != restriction_reasons || c->is_scam != is_scam) {
     c->has_linked_channel = has_linked_channel;
     c->has_location = has_location;
     c->has_active_group_call = has_active_group_call;
-    c->sign_messages = sign_messages;
     c->is_slow_mode_enabled = is_slow_mode_enabled;
     c->is_megagroup = is_megagroup;
-    c->is_verified = is_verified;
     c->restriction_reasons = std::move(restriction_reasons);
     c->is_scam = is_scam;
 
     c->is_changed = true;
     need_invalidate_channel_full = true;
   }
+  if (c->is_group_call_empty != is_group_call_empty || c->sign_messages != sign_messages ||
+      c->is_verified != is_verified) {
+    c->is_group_call_empty = is_group_call_empty;
+    c->sign_messages = sign_messages;
+    c->is_verified = is_verified;
+
+    c->is_changed = true;
+  }
 
   if (c->cache_version != Channel::CACHE_VERSION) {
     c->cache_version = Channel::CACHE_VERSION;
@@ -14102,6 +14114,7 @@ void ContactsManager::on_chat_update(telegram_api::channelForbidden &channel, co
   on_update_channel_default_permissions(c, channel_id, get_restricted_rights(banned_rights));
 
   bool has_active_group_call = false;
+  bool is_group_call_empty = false;
   bool sign_messages = false;
   bool is_slow_mode_enabled = false;
   bool is_megagroup = (channel.flags_ & CHANNEL_FLAG_IS_MEGAGROUP) != 0;
@@ -14125,22 +14138,27 @@ void ContactsManager::on_chat_update(telegram_api::channelForbidden &channel, co
   }
 
   bool need_invalidate_channel_full = false;
-  if (c->has_active_group_call != has_active_group_call || c->sign_messages != sign_messages ||
-      c->is_slow_mode_enabled != is_slow_mode_enabled || c->is_megagroup != is_megagroup ||
-      c->is_verified != is_verified || !c->restriction_reasons.empty() || c->is_scam != is_scam) {
+  if (c->has_active_group_call != has_active_group_call || c->is_slow_mode_enabled != is_slow_mode_enabled ||
+      c->is_megagroup != is_megagroup || !c->restriction_reasons.empty() || c->is_scam != is_scam) {
     // c->has_linked_channel = has_linked_channel;
     // c->has_location = has_location;
     c->has_active_group_call = has_active_group_call;
-    c->sign_messages = sign_messages;
     c->is_slow_mode_enabled = is_slow_mode_enabled;
     c->is_megagroup = is_megagroup;
-    c->is_verified = is_verified;
     c->restriction_reasons.clear();
     c->is_scam = is_scam;
 
     c->is_changed = true;
     need_invalidate_channel_full = true;
   }
+  if (c->is_group_call_empty != is_group_call_empty || c->sign_messages != sign_messages ||
+      c->is_verified != is_verified) {
+    c->is_group_call_empty = is_group_call_empty;
+    c->sign_messages = sign_messages;
+    c->is_verified = is_verified;
+
+    c->is_changed = true;
+  }
 
   if (c->cache_version != Channel::CACHE_VERSION) {
     c->cache_version = Channel::CACHE_VERSION;
@@ -14356,7 +14374,7 @@ td_api::object_ptr<td_api::updateSupergroup> ContactsManager::get_update_unknown
     ChannelId channel_id) {
   return td_api::make_object<td_api::updateSupergroup>(td_api::make_object<td_api::supergroup>(
       channel_id.get(), string(), 0, DialogParticipantStatus::Banned(0).get_chat_member_status_object(), 0, false,
-      false, false, false, false, true, false, "", false));
+      false, false, false, false, false, true, false, "", false));
 }
 
 int32 ContactsManager::get_supergroup_id_object(ChannelId channel_id, const char *source) const {
@@ -14378,8 +14396,8 @@ tl_object_ptr<td_api::supergroup> ContactsManager::get_supergroup_object(Channel
   }
   return td_api::make_object<td_api::supergroup>(
       channel_id.get(), c->username, c->date, get_channel_status(c).get_chat_member_status_object(),
-      c->participant_count, c->has_linked_channel, c->has_location, c->has_active_group_call, c->sign_messages,
-      c->is_slow_mode_enabled, !c->is_megagroup, c->is_verified,
+      c->participant_count, c->has_linked_channel, c->has_location, c->has_active_group_call, c->is_group_call_empty,
+      c->sign_messages, c->is_slow_mode_enabled, !c->is_megagroup, c->is_verified,
       get_restriction_reason_description(c->restriction_reasons), c->is_scam);
 }
 
diff --git a/td/telegram/ContactsManager.h b/td/telegram/ContactsManager.h
index a0b639475..b5635011c 100644
--- a/td/telegram/ContactsManager.h
+++ b/td/telegram/ContactsManager.h
@@ -795,6 +795,7 @@ class ContactsManager : public Actor {
     bool has_linked_channel = false;
     bool has_location = false;
     bool has_active_group_call = false;
+    bool is_group_call_empty = false;
     bool sign_messages = false;
     bool is_slow_mode_enabled = false;
 
@@ -1026,6 +1027,7 @@ class ContactsManager : public Actor {
   static constexpr int32 CHANNEL_FLAG_HAS_LOCATION = 1 << 21;
   static constexpr int32 CHANNEL_FLAG_IS_SLOW_MODE_ENABLED = 1 << 22;
   static constexpr int32 CHANNEL_FLAG_HAS_ACTIVE_GROUP_CALL = 1 << 23;
+  static constexpr int32 CHANNEL_FLAG_IS_GROUP_CALL_EMPTY = 1 << 24;
 
   static constexpr int32 CHANNEL_FULL_FLAG_HAS_PARTICIPANT_COUNT = 1 << 0;
   static constexpr int32 CHANNEL_FULL_FLAG_HAS_ADMINISTRATOR_COUNT = 1 << 1;