diff --git a/server/datamodel.go b/server/datamodel.go
index 41387c0..f9ba13a 100644
--- a/server/datamodel.go
+++ b/server/datamodel.go
@@ -863,6 +863,9 @@ type ServerComMessage struct {
 	// Session ID to skip when sendng packet to sessions. Used to skip sending to original session.
 	// Could be either empty.
 	SkipSid string `json:"-"`
+	// PreserveTopicName prevents p2p/channel topic aliasing for server-generated
+	// messages which are already using the API-visible topic name.
+	PreserveTopicName bool `json:"-"`
 	// User id affected by this message.
 	uid types.Uid
 }
@@ -874,14 +877,15 @@ func (src *ServerComMessage) copy() *ServerComMessage {
 		return nil
 	}
 	dst := &ServerComMessage{
-		TenantID:  src.TenantID,
-		Id:        src.Id,
-		RcptTo:    src.RcptTo,
-		AsUser:    src.AsUser,
-		Timestamp: src.Timestamp,
-		sess:      src.sess,
-		SkipSid:   src.SkipSid,
-		uid:       src.uid,
+		TenantID:          src.TenantID,
+		Id:                src.Id,
+		RcptTo:            src.RcptTo,
+		AsUser:            src.AsUser,
+		Timestamp:         src.Timestamp,
+		sess:              src.sess,
+		SkipSid:           src.SkipSid,
+		PreserveTopicName: src.PreserveTopicName,
+		uid:               src.uid,
 	}
 
 	dst.Ctrl = src.Ctrl.copy()
diff --git a/server/im_http.go b/server/im_http.go
index 3516fe1..88d3bcb 100644
--- a/server/im_http.go
+++ b/server/im_http.go
@@ -4475,7 +4475,7 @@ func serveIMConversationMessages(wrt http.ResponseWriter, req *http.Request, pri
 			writeIMRelationError(wrt, req, err)
 			return
 		}
-		if sub == nil || !(sub.ModeGiven&sub.ModeWant).IsReader() {
+		if sub == nil || !(sub.ModeGiven & sub.ModeWant).IsReader() {
 			writeIMError(wrt, req, http.StatusForbidden, 30005, imReasonForbidden, "permission denied", nil)
 			return
 		}
@@ -11277,10 +11277,11 @@ func broadcastIMConversationSystemMessage(tenantID types.TenantID, msg *types.Me
 		timestamp = time.Now().UTC().Round(time.Millisecond)
 	}
 	out := &ServerComMessage{
-		TenantID:  tenantID,
-		RcptTo:    msg.Topic,
-		AsUser:    types.ParseUid(msg.From).UserId(),
-		Timestamp: timestamp,
+		TenantID:          tenantID,
+		RcptTo:            msg.Topic,
+		AsUser:            types.ParseUid(msg.From).UserId(),
+		Timestamp:         timestamp,
+		PreserveTopicName: true,
 		Data: &MsgServerData{
 			Topic:     msg.Topic,
 			From:      types.ParseUid(msg.From).UserId(),
@@ -11296,7 +11297,7 @@ func broadcastIMConversationSystemMessage(tenantID types.TenantID, msg *types.Me
 		logs.Warn.Printf("im system message: hub route queue full topic=%s seq=%d", msg.Topic, msg.SeqId)
 	}
 	deliverIMConversationSystemMessageToP2PSessions(tenantID, msg, out)
-	broadcastHTTPForwardPresence(tenantID, msg, timestamp)
+	broadcastIMConversationSystemPresence(tenantID, msg, timestamp)
 }
 
 func publishIMGroupInvitationNotification(tenantID types.TenantID, inv *types.GroupInvitation) {
@@ -11335,16 +11336,15 @@ func deliverIMConversationSystemMessageToP2PSessions(tenantID types.TenantID, ms
 		if _, ok := participants[session.uid]; !ok {
 			return true
 		}
-		viewTopic, err := types.P2PNameForUser(session.uid, msg.Topic)
-		if err != nil || viewTopic == "" {
+		if _, err := types.P2PNameForUser(session.uid, msg.Topic); err != nil {
 			return true
 		}
-		if session.getSub(msg.Topic) != nil || session.getSub(viewTopic) != nil {
+		if session.getSub(msg.Topic) != nil {
 			return true
 		}
 		msgCopy := out.copy()
 		msgCopy.RcptTo = session.uid.UserId()
-		msgCopy.Data.Topic = viewTopic
+		msgCopy.Data.Topic = msg.Topic
 		if !session.queueOut(msgCopy) {
 			logs.Warn.Printf("im system message: session queue full topic=%s seq=%d user=%s", msg.Topic, msg.SeqId, session.uid.UserId())
 		}
@@ -11352,6 +11352,35 @@ func deliverIMConversationSystemMessageToP2PSessions(tenantID types.TenantID, ms
 	})
 }
 
+func broadcastIMConversationSystemPresence(tenantID types.TenantID, msg *types.Message, timestamp time.Time) {
+	if globals.hub == nil || msg == nil || msg.SeqId <= 0 || msg.Topic == "" {
+		return
+	}
+	uid1, uid2, err := types.ParseP2P(msg.Topic)
+	if err != nil {
+		return
+	}
+	for _, uid := range []types.Uid{uid1, uid2} {
+		select {
+		case globals.hub.routeSrv <- &ServerComMessage{
+			TenantID:          tenantID,
+			RcptTo:            uid.UserId(),
+			Timestamp:         timestamp,
+			PreserveTopicName: true,
+			Pres: &MsgServerPres{
+				Topic:     "me",
+				What:      "msg",
+				Src:       msg.Topic,
+				SeqId:     msg.SeqId,
+				SkipTopic: msg.Topic,
+			},
+		}:
+		default:
+			logs.Warn.Printf("im system message: hub presence queue full topic=%s seq=%d user=%s", msg.Topic, msg.SeqId, uid.UserId())
+		}
+	}
+}
+
 func systemNotificationIDFromPath(path string) string {
 	const marker = "/v1/im/system-notifications/"
 	idx := strings.Index(path, marker)
diff --git a/server/im_http_test.go b/server/im_http_test.go
index e9b6c45..c898d1d 100644
--- a/server/im_http_test.go
+++ b/server/im_http_test.go
@@ -7894,7 +7894,7 @@ func TestPublishIMConversationSystemNoticeDeliversToOnlineP2PSessions(t *testing
 			if !ok || msg.Data == nil {
 				t.Fatalf("unexpected outbound for %s: %#v", uid.UserId(), raw)
 			}
-			if msg.Data.Topic != mustP2PNameForUser(t, uid, topic) || msg.Data.SeqId != 1 {
+			if msg.Data.Topic != topic || msg.Data.SeqId != 1 {
 				t.Fatalf("unexpected p2p data for %s: %#v", uid.UserId(), msg.Data)
 			}
 			if msg.Data.Head["x-im-template"] != "friend_added" || msg.Data.Head["x-im-type"] != "system_notice" {
@@ -7906,6 +7906,69 @@ func TestPublishIMConversationSystemNoticeDeliversToOnlineP2PSessions(t *testing
 	}
 }
 
+func TestPublishIMConversationSystemNoticePresenceUsesP2PTopic(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+	oldStore := store.Store
+	oldTopics := store.Topics
+	oldMessages := store.Messages
+	oldHub := globals.hub
+	mockStore := mock_store.NewMockPersistentStorageInterface(ctrl)
+	topics := mock_store.NewMockTopicsPersistenceInterface(ctrl)
+	messages := mock_store.NewMockMessagesPersistenceInterface(ctrl)
+	store.Store = mockStore
+	store.Topics = topics
+	store.Messages = messages
+	globals.hub = &Hub{routeSrv: make(chan *ServerComMessage, 4)}
+	defer func() {
+		store.Store = oldStore
+		store.Topics = oldTopics
+		store.Messages = oldMessages
+		globals.hub = oldHub
+	}()
+	mockStore.EXPECT().IsOpen().Return(true)
+
+	applicant := types.Uid(1)
+	target := types.Uid(2)
+	topic := applicant.P2PName(target)
+	topics.EXPECT().Get(types.TenantID(7), topic).Return(&types.Topic{TenantID: 7, SeqId: 16}, nil)
+	messages.EXPECT().Save(types.TenantID(7), gomock.Any(), nil, false).DoAndReturn(
+		func(_ types.TenantID, msg *types.Message, _ []string, _ bool) (*types.MessageSaveResult, error) {
+			if msg.Topic != topic || msg.SeqId != 17 {
+				t.Fatalf("unexpected saved message: %#v", msg)
+			}
+			return &types.MessageSaveResult{SeqId: msg.SeqId}, nil
+		})
+
+	publishIMConversationSystemNotice(types.TenantID(7), topic,
+		"system_notice", "friend_added", "你们已成为好友，现在可以开始聊天了。",
+		[]imSystemMessageActor{
+			{UserID: applicant.UserId(), Click: map[string]any{"type": "user_profile", "target_id": applicant.UserId()}},
+			{UserID: target.UserId(), Click: map[string]any{"type": "user_profile", "target_id": target.UserId()}},
+		}, nil, map[string]any{"request_id": "frq_1"})
+
+	select {
+	case routed := <-globals.hub.routeSrv:
+		if routed.Data == nil || routed.Data.Topic != topic || !routed.PreserveTopicName {
+			t.Fatalf("unexpected system data broadcast: %#v", routed)
+		}
+	default:
+		t.Fatal("expected system data broadcast")
+	}
+	for _, uid := range []types.Uid{applicant, target} {
+		select {
+		case routed := <-globals.hub.routeSrv:
+			if routed.RcptTo != uid.UserId() || routed.Pres == nil || routed.Pres.Topic != "me" ||
+				routed.Pres.Src != topic || routed.Pres.SeqId != 17 || routed.Pres.SkipTopic != topic ||
+				!routed.PreserveTopicName {
+				t.Fatalf("unexpected system presence for %s: %#v", uid.UserId(), routed)
+			}
+		default:
+			t.Fatalf("expected system presence for %s", uid.UserId())
+		}
+	}
+}
+
 func mustP2PNameForUser(t *testing.T, uid types.Uid, topic string) string {
 	t.Helper()
 	name, err := types.P2PNameForUser(uid, topic)
diff --git a/server/topic.go b/server/topic.go
index 1039249..c99d902 100644
--- a/server/topic.go
+++ b/server/topic.go
@@ -261,7 +261,7 @@ func (t *Topic) prepareBroadcastableMessage(msg *ServerComMessage, uid types.Uid
 		return
 	}
 
-	if (t.cat == types.TopicCatP2P && !uid.IsZero()) || (t.cat == types.TopicCatGrp && t.isChan) {
+	if !msg.PreserveTopicName && ((t.cat == types.TopicCatP2P && !uid.IsZero()) || (t.cat == types.TopicCatGrp && t.isChan)) {
 		// P2P topics are exposed by their canonical p2p... name. Channel topics
 		// may be presented as grpXXX or chnXXX.
 		var topicName string