diff --git a/galene.go b/galene.go
index cf537eb..b50f2e8 100644
--- a/galene.go
+++ b/galene.go
@@ -39,6 +39,8 @@ func main() {
 	flag.StringVar(&mutexprofile, "mutexprofile", "",
 		"store mutex profile in `file`")
 	flag.BoolVar(&group.UseMDNS, "mdns", false, "gather mDNS addresses")
+	flag.BoolVar(&group.ICERelayOnly, "relay-only", false,
+		"require use of TURN relays for all media traffic")
 	flag.Parse()
 
 	if cpuprofile != "" {
diff --git a/group/ice.go b/group/ice.go
index c79d8d2..243381d 100644
--- a/group/ice.go
+++ b/group/ice.go
@@ -22,6 +22,7 @@ type RTCConfiguration struct {
 }
 
 var ICEFilename string
+var ICERelayOnly bool
 
 var iceConf RTCConfiguration
 var iceOnce sync.Once
@@ -44,6 +45,9 @@ func ICEConfiguration() *RTCConfiguration {
 		iceConf = RTCConfiguration{
 			ICEServers: iceServers,
 		}
+		if ICERelayOnly {
+			iceConf.ICETransportPolicy = "relay"
+		}
 	})
 
 	return &iceConf