diff --git a/Telegram/SourceFiles/calls/calls_group_call.cpp b/Telegram/SourceFiles/calls/calls_group_call.cpp
index 0d9bde1c3b..aa6d15059c 100644
--- a/Telegram/SourceFiles/calls/calls_group_call.cpp
+++ b/Telegram/SourceFiles/calls/calls_group_call.cpp
@@ -29,16 +29,12 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "webrtc/webrtc_media_devices.h"
 #include "webrtc/webrtc_create_adm.h"
 
-#include <tgcalls/group/GroupInstanceImpl.h>
+#include <tgcalls/group/GroupInstanceCustomImpl.h>
 
 #include <QtCore/QJsonDocument>
 #include <QtCore/QJsonObject>
 #include <QtCore/QJsonArray>
 
-namespace tgcalls {
-class GroupInstanceImpl;
-} // namespace tgcalls
-
 namespace Calls {
 namespace {
 
@@ -304,6 +300,8 @@ void GroupCall::join(const MTPInputGroupCall &inputCall) {
 		}
 	}, _lifetime);
 
+	addParticipantsToInstance();
+
 	SubscribeToMigration(_peer, _lifetime, [=](not_null<ChannelData*> group) {
 		_peer = group;
 	});
@@ -636,7 +634,12 @@ void GroupCall::handleUpdate(const MTPGroupCall &call) {
 						.relPort = readString(object, "relPort"),
 					});
 				}
-				_instance->setJoinResponsePayload(payload);
+				_instance->setConnectionMode(
+					tgcalls::GroupConnectionMode::GroupConnectionModeRtc);
+				_instance->setJoinResponsePayload(payload, {});
+				_instancePayloadsDone = true;
+
+				addParticipantsToInstance();
 			});
 		}
 	}, [&](const MTPDgroupCallDiscarded &data) {
@@ -647,6 +650,45 @@ void GroupCall::handleUpdate(const MTPGroupCall &call) {
 	});
 }
 
+void GroupCall::addParticipantsToInstance() {
+	const auto real = _peer->groupCall();
+	if (!real || (real->id() != _id) || !_instancePayloadsDone) {
+		return;
+	}
+	for (const auto &participant : real->participants()) {
+		prepareParticipantForAdding(participant);
+	}
+	addPreparedParticipants();
+}
+
+void GroupCall::prepareParticipantForAdding(
+		const Data::GroupCallParticipant &participant) {
+	_preparedParticipants.push_back(tgcalls::GroupParticipantDescription());
+	auto &added = _preparedParticipants.back();
+	added.audioSsrc = participant.ssrc;
+	_unresolvedSsrcs.remove(added.audioSsrc);
+}
+
+void GroupCall::addPreparedParticipants() {
+	_addPreparedParticipantsScheduled = false;
+	if (!_preparedParticipants.empty()) {
+		_instance->addParticipants(base::take(_preparedParticipants));
+	}
+	if (const auto real = _peer->groupCall(); real && real->id() == _id) {
+		if (!_unresolvedSsrcs.empty()) {
+			real->resolveParticipants(base::take(_unresolvedSsrcs));
+		}
+	}
+}
+
+void GroupCall::addPreparedParticipantsDelayed() {
+	if (_addPreparedParticipantsScheduled) {
+		return;
+	}
+	_addPreparedParticipantsScheduled = true;
+	crl::on_main(this, [=] { addPreparedParticipants(); });
+}
+
 void GroupCall::handleUpdate(const MTPDupdateGroupCallParticipants &data) {
 	const auto state = _state.current();
 	if (state != State::Joined && state != State::Connecting) {
@@ -751,6 +793,12 @@ void GroupCall::createAndStartController() {
 		.initialOutputDeviceId = _audioOutputId.toStdString(),
 		.createAudioDeviceModule = Webrtc::AudioDeviceModuleCreator(
 			settings.callAudioBackend()),
+		.participantDescriptionsRequired = [=](
+				const std::vector<uint32_t> &ssrcs) {
+			crl::on_main(weak, [=] {
+				requestParticipantsInformation(ssrcs);
+			});
+		},
 	};
 	if (Logs::DebugEnabled()) {
 		auto callLogFolder = cWorkingDir() + qsl("DebugLogs");
@@ -768,7 +816,8 @@ void GroupCall::createAndStartController() {
 	}
 
 	LOG(("Call Info: Creating group instance"));
-	_instance = std::make_unique<tgcalls::GroupInstanceImpl>(
+	_instancePayloadsDone = false;
+	_instance = std::make_unique<tgcalls::GroupInstanceCustomImpl>(
 		std::move(descriptor));
 
 	updateInstanceMuteState();
@@ -777,6 +826,34 @@ void GroupCall::createAndStartController() {
 	//raw->setAudioOutputDuckingEnabled(settings.callAudioDuckingEnabled());
 }
 
+void GroupCall::requestParticipantsInformation(
+		const std::vector<uint32_t> &ssrcs) {
+	const auto real = _peer->groupCall();
+	if (!real || real->id() != _id || !_instancePayloadsDone) {
+		for (const auto ssrc : ssrcs) {
+			_unresolvedSsrcs.emplace(ssrc);
+		}
+		return;
+	}
+
+	const auto &existing = real->participants();
+	for (const auto ssrc : ssrcs) {
+		const auto participantPeer = real->participantPeerBySsrc(ssrc);
+		if (!participantPeer) {
+			_unresolvedSsrcs.emplace(ssrc);
+			continue;
+		}
+		const auto i = ranges::find(
+			existing,
+			not_null{ participantPeer },
+			&Data::GroupCall::Participant::peer);
+		Assert(i != end(existing));
+
+		prepareParticipantForAdding(*i);
+	}
+	addPreparedParticipants();
+}
+
 void GroupCall::updateInstanceMuteState() {
 	Expects(_instance != nullptr);
 
diff --git a/Telegram/SourceFiles/calls/calls_group_call.h b/Telegram/SourceFiles/calls/calls_group_call.h
index 2ed5f8c325..68a6d6a073 100644
--- a/Telegram/SourceFiles/calls/calls_group_call.h
+++ b/Telegram/SourceFiles/calls/calls_group_call.h
@@ -16,8 +16,9 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 class History;
 
 namespace tgcalls {
-class GroupInstanceImpl;
+class GroupInstanceCustomImpl;
 struct GroupLevelsUpdate;
+struct GroupParticipantDescription;
 } // namespace tgcalls
 
 namespace base {
@@ -31,6 +32,7 @@ class MediaDevices;
 
 namespace Data {
 struct LastSpokeTimes;
+struct GroupCallParticipant;
 } // namespace Data
 
 namespace Calls {
@@ -207,6 +209,13 @@ private:
 	void stopConnectingSound();
 	void playConnectingSoundOnce();
 
+	void requestParticipantsInformation(const std::vector<uint32_t> &ssrcs);
+	void addParticipantsToInstance();
+	void prepareParticipantForAdding(
+		const Data::GroupCallParticipant &participant);
+	void addPreparedParticipants();
+	void addPreparedParticipantsDelayed();
+
 	void editParticipant(
 		not_null<PeerData*> participantPeer,
 		bool mute,
@@ -224,6 +233,10 @@ private:
 	MTP::Sender _api;
 	rpl::variable<State> _state = State::Creating;
 	bool _instanceConnected = false;
+	bool _instancePayloadsDone = false;
+	base::flat_set<uint32> _unresolvedSsrcs;
+	std::vector<tgcalls::GroupParticipantDescription> _preparedParticipants;
+	bool _addPreparedParticipantsScheduled = false;
 
 	not_null<PeerData*> _joinAs;
 	std::vector<not_null<PeerData*>> _possibleJoinAs;
@@ -239,7 +252,7 @@ private:
 	mtpRequestId _createRequestId = 0;
 	mtpRequestId _updateMuteRequestId = 0;
 
-	std::unique_ptr<tgcalls::GroupInstanceImpl> _instance;
+	std::unique_ptr<tgcalls::GroupInstanceCustomImpl> _instance;
 	rpl::event_stream<LevelUpdate> _levelUpdates;
 	base::flat_map<uint32, Data::LastSpokeTimes> _lastSpoke;
 	rpl::event_stream<Group::RejoinEvent> _rejoinEvents;
diff --git a/Telegram/SourceFiles/data/data_group_call.cpp b/Telegram/SourceFiles/data/data_group_call.cpp
index 238982f8e9..baeb26fb19 100644
--- a/Telegram/SourceFiles/data/data_group_call.cpp
+++ b/Telegram/SourceFiles/data/data_group_call.cpp
@@ -378,6 +378,16 @@ void GroupCall::applyLastSpoke(
 	}
 }
 
+void GroupCall::resolveParticipants(const base::flat_set<uint32> &ssrcs) {
+	if (ssrcs.empty()) {
+		return;
+	}
+	for (const auto ssrc : ssrcs) {
+		_unknownSpokenSsrcs.emplace(ssrc, LastSpokeTimes());
+	}
+	requestUnknownParticipants();
+}
+
 void GroupCall::applyActiveUpdate(
 		PeerId participantPeerId,
 		LastSpokeTimes when,
@@ -531,7 +541,9 @@ void GroupCall::requestUnknownParticipants() {
 		_unknownParticipantPeersRequestId = 0;
 		const auto now = crl::now();
 		for (const auto [ssrc, when] : ssrcs) {
-			applyLastSpoke(ssrc, when, now);
+			if (when.voice || when.anything) {
+				applyLastSpoke(ssrc, when, now);
+			}
 			_unknownSpokenSsrcs.remove(ssrc);
 		}
 		for (const auto [id, when] : participantPeerIds) {
diff --git a/Telegram/SourceFiles/data/data_group_call.h b/Telegram/SourceFiles/data/data_group_call.h
index f353e4c0e4..854710c41d 100644
--- a/Telegram/SourceFiles/data/data_group_call.h
+++ b/Telegram/SourceFiles/data/data_group_call.h
@@ -20,6 +20,21 @@ struct LastSpokeTimes {
 	crl::time voice = 0;
 };
 
+struct GroupCallParticipant {
+	not_null<PeerData*> peer;
+	TimeId date = 0;
+	TimeId lastActive = 0;
+	uint32 ssrc = 0;
+	int volume = 0;
+	bool applyVolumeFromMin = true;
+	bool sounding = false;
+	bool speaking = false;
+	bool muted = false;
+	bool mutedByMe = false;
+	bool canSelfUnmute = false;
+	bool onlyMinLoaded = false;
+};
+
 class GroupCall final {
 public:
 	GroupCall(not_null<PeerData*> peer, uint64 id, uint64 accessHash);
@@ -40,20 +55,7 @@ public:
 
 	void setPeer(not_null<PeerData*> peer);
 
-	struct Participant {
-		not_null<PeerData*> peer;
-		TimeId date = 0;
-		TimeId lastActive = 0;
-		uint32 ssrc = 0;
-		int volume = 0;
-		bool applyVolumeFromMin = true;
-		bool sounding = false;
-		bool speaking = false;
-		bool muted = false;
-		bool mutedByMe = false;
-		bool canSelfUnmute = false;
-		bool onlyMinLoaded = false;
-	};
+	using Participant = GroupCallParticipant;
 	struct ParticipantUpdate {
 		std::optional<Participant> was;
 		std::optional<Participant> now;
@@ -65,6 +67,7 @@ public:
 		-> const std::vector<Participant> &;
 	void requestParticipants();
 	[[nodiscard]] bool participantsLoaded() const;
+	[[nodiscard]] PeerData *participantPeerBySsrc(uint32 ssrc) const;
 
 	[[nodiscard]] rpl::producer<> participantsSliceAdded();
 	[[nodiscard]] rpl::producer<ParticipantUpdate> participantUpdated() const;
@@ -79,6 +82,8 @@ public:
 		LastSpokeTimes when,
 		PeerData *participantPeerLoaded);
 
+	void resolveParticipants(const base::flat_set<uint32> &ssrcs);
+
 	[[nodiscard]] int fullCount() const;
 	[[nodiscard]] rpl::producer<int> fullCountValue() const;
 
@@ -105,7 +110,6 @@ private:
 	void requestUnknownParticipants();
 	void changePeerEmptyCallFlag();
 	void checkFinishSpeakingByActive();
-	[[nodiscard]] PeerData *participantPeerBySsrc(uint32 ssrc) const;
 
 	const uint64 _id = 0;
 	const uint64 _accessHash = 0;
diff --git a/Telegram/cmake/lib_tgcalls.cmake b/Telegram/cmake/lib_tgcalls.cmake
index 7a7e68ed0f..d21dd0b007 100644
--- a/Telegram/cmake/lib_tgcalls.cmake
+++ b/Telegram/cmake/lib_tgcalls.cmake
@@ -47,6 +47,8 @@ PRIVATE
     Message.h
     NetworkManager.cpp
     NetworkManager.h
+    StaticThreads.cpp
+    StaticThreads.h
     ThreadLocalObject.h
     VideoCaptureInterface.cpp
     VideoCaptureInterface.h
@@ -54,8 +56,12 @@ PRIVATE
     VideoCaptureInterfaceImpl.h
     VideoCapturerInterface.h
 
-    group/GroupInstanceImpl.cpp
-    group/GroupInstanceImpl.h
+    group/GroupInstanceCustomImpl.cpp
+    group/GroupInstanceCustomImpl.h
+    group/GroupNetworkManager.cpp
+    group/GroupNetworkManager.h
+    group/StreamingPart.cpp
+    group/StreamingPart.h
 
     platform/PlatformInterface.h
 
@@ -119,6 +125,7 @@ PRIVATE
 target_link_libraries(lib_tgcalls
 PRIVATE
     desktop-app::external_webrtc
+    desktop-app::external_opus
 )
 
 target_compile_definitions(lib_tgcalls