diff --git a/api_async.go b/api_async.go
index a78adff..d3c0426 100644
--- a/api_async.go
+++ b/api_async.go
@@ -21,7 +21,11 @@
  */
 package signaling
 
-import "time"
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+)
 
 type AsyncMessage struct {
 	SendTime time.Time `json:"sendtime"`
@@ -41,6 +45,14 @@ type AsyncMessage struct {
 	Id string `json:"id"`
 }
 
+func (m *AsyncMessage) String() string {
+	data, err := json.Marshal(m)
+	if err != nil {
+		return fmt.Sprintf("Could not serialize %#v: %s", m, err)
+	}
+	return string(data)
+}
+
 type AsyncRoomMessage struct {
 	Type string `json:"type"`
 
diff --git a/api_backend.go b/api_backend.go
index 44e7672..e957a3c 100644
--- a/api_backend.go
+++ b/api_backend.go
@@ -33,6 +33,7 @@ import (
 	"net/url"
 	"regexp"
 	"strings"
+	"time"
 )
 
 const (
@@ -107,6 +108,8 @@ type BackendServerRoomRequest struct {
 
 	Dialout *BackendRoomDialoutRequest `json:"dialout,omitempty"`
 
+	Transient *BackendRoomTransientRequest `json:"transient,omitempty"`
+
 	// Internal properties
 	ReceivedTime int64 `json:"received,omitempty"`
 }
@@ -200,6 +203,20 @@ func (r *BackendRoomDialoutRequest) ValidateNumber() *Error {
 	return nil
 }
 
+type TransientAction string
+
+const (
+	TransientActionSet    TransientAction = "set"
+	TransientActionDelete TransientAction = "delete"
+)
+
+type BackendRoomTransientRequest struct {
+	Action TransientAction `json:"action"`
+	Key    string          `json:"key"`
+	Value  interface{}     `json:"value,omitempty"`
+	TTL    time.Duration   `json:"ttl,omitempty"`
+}
+
 type BackendServerRoomResponse struct {
 	Type string `json:"type"`
 
diff --git a/hub.go b/hub.go
index a2eb83f..bbcfc98 100644
--- a/hub.go
+++ b/hub.go
@@ -97,6 +97,9 @@ var (
 
 	// Delay after which a screen publisher should be cleaned up.
 	cleanupScreenPublisherDelay = time.Second
+
+	// Delay after which a "cleared" / "rejected" dialout status should be removed.
+	removeCallStatusTTL = 5 * time.Second
 )
 
 const (
@@ -1942,14 +1945,34 @@ func (h *Hub) processInternalMsg(client *Client, message *ClientMessage) {
 	case "dialout":
 		roomId := msg.Dialout.RoomId
 		msg.Dialout.RoomId = "" // Don't send room id to recipients.
-		if err := h.events.PublishRoomMessage(roomId, session.Backend(), &AsyncMessage{
-			Type: "message",
-			Message: &ServerMessage{
-				Type:    "dialout",
-				Dialout: msg.Dialout,
-			},
-		}); err != nil {
-			log.Printf("Error publishing dialout message %+v to room %s", msg.Dialout, roomId)
+		if msg.Dialout.Type == "status" {
+			asyncMessage := &AsyncMessage{
+				Type: "room",
+				Room: &BackendServerRoomRequest{
+					Type: "transient",
+					Transient: &BackendRoomTransientRequest{
+						Action: TransientActionSet,
+						Key:    "callstatus_" + msg.Dialout.Status.CallId,
+						Value:  msg.Dialout.Status,
+					},
+				},
+			}
+			if msg.Dialout.Status.Status == DialoutStatusCleared || msg.Dialout.Status.Status == DialoutStatusRejected {
+				asyncMessage.Room.Transient.TTL = removeCallStatusTTL
+			}
+			if err := h.events.PublishBackendRoomMessage(roomId, session.Backend(), asyncMessage); err != nil {
+				log.Printf("Error publishing dialout message %+v to room %s", msg.Dialout, roomId)
+			}
+		} else {
+			if err := h.events.PublishRoomMessage(roomId, session.Backend(), &AsyncMessage{
+				Type: "message",
+				Message: &ServerMessage{
+					Type:    "dialout",
+					Dialout: msg.Dialout,
+				},
+			}); err != nil {
+				log.Printf("Error publishing dialout message %+v to room %s", msg.Dialout, roomId)
+			}
 		}
 	default:
 		log.Printf("Ignore unsupported internal message %+v from %s", msg, session.PublicId())
diff --git a/room.go b/room.go
index e0a533a..8d983ef 100644
--- a/room.go
+++ b/room.go
@@ -244,6 +244,15 @@ func (r *Room) processBackendRoomRequestRoom(message *BackendServerRoomRequest)
 		r.publishRoomMessage(message.Message)
 	case "switchto":
 		r.publishSwitchTo(message.SwitchTo)
+	case "transient":
+		switch message.Transient.Action {
+		case TransientActionSet:
+			r.SetTransientDataTTL(message.Transient.Key, message.Transient.Value, message.Transient.TTL)
+		case TransientActionDelete:
+			r.RemoveTransientData(message.Transient.Key)
+		default:
+			log.Printf("Unsupported transient action in room %s: %+v", r.Id(), message.Transient)
+		}
 	default:
 		log.Printf("Unsupported backend room request with type %s in %s: %+v", message.Type, r.Id(), message)
 	}