diff --git a/api_signaling.go b/api_signaling.go
index edd1fd2..6cfdec5 100644
--- a/api_signaling.go
+++ b/api_signaling.go
@@ -793,7 +793,8 @@ func (m *InternalClientMessage) CheckValid() error {
 }
 
 type InternalServerDialoutRequest struct {
-	RoomId string `json:"roomid"`
+	RoomId  string `json:"roomid"`
+	Backend string `json:"backend"`
 
 	Request *BackendRoomDialoutRequest `json:"request"`
 }
diff --git a/backend_server.go b/backend_server.go
index 9b01387..3c8b0f0 100644
--- a/backend_server.go
+++ b/backend_server.go
@@ -698,6 +698,7 @@ func (b *BackendServer) startDialout(roomid string, backend *Backend, request *B
 			Type: "dialout",
 			Dialout: &InternalServerDialoutRequest{
 				RoomId:  roomid,
+				Backend: backend.Url(),
 				Request: request.Dialout,
 			},
 		},
diff --git a/backend_server_test.go b/backend_server_test.go
index a950b5c..d50f552 100644
--- a/backend_server_test.go
+++ b/backend_server_test.go
@@ -79,11 +79,13 @@ func CreateBackendServerForTestFromConfig(t *testing.T, config *goconf.ConfigFil
 	if err != nil {
 		t.Fatal(err)
 	}
-	config.AddOption("backend", "allowed", u.Host)
+	backendId := "backend1"
+	config.AddOption("backend", "backends", backendId)
+	config.AddOption(backendId, "url", server.URL)
 	if u.Scheme == "http" {
 		config.AddOption("backend", "allowhttp", "true")
 	}
-	config.AddOption("backend", "secret", string(testBackendSecret))
+	config.AddOption(backendId, "secret", string(testBackendSecret))
 	config.AddOption("sessions", "hashkey", "12345678901234567890123456789012")
 	config.AddOption("sessions", "blockkey", "09876543210987654321098765432109")
 	config.AddOption("clients", "internalsecret", string(testInternalSecret))
@@ -1886,6 +1888,9 @@ func TestBackendServer_DialoutAccepted(t *testing.T) {
 		if msg.Internal.Dialout.RoomId != roomId {
 			t.Errorf("expected room id %s, got %+v", roomId, msg)
 		}
+		if url := server.URL + "/"; msg.Internal.Dialout.Backend != url {
+			t.Errorf("expected backend %s, got %+v", url, msg)
+		}
 
 		response := &ClientMessage{
 			Id:   msg.Id,
@@ -1990,6 +1995,9 @@ func TestBackendServer_DialoutRejected(t *testing.T) {
 		if msg.Internal.Dialout.RoomId != roomId {
 			t.Errorf("expected room id %s, got %+v", roomId, msg)
 		}
+		if url := server.URL + "/"; msg.Internal.Dialout.Backend != url {
+			t.Errorf("expected backend %s, got %+v", url, msg)
+		}
 
 		response := &ClientMessage{
 			Id:   msg.Id,