diff --git a/Classes/LinphoneUI/LinphoneManager.m b/Classes/LinphoneUI/LinphoneManager.m
index 65ec30936..fbfc39ae2 100644
--- a/Classes/LinphoneUI/LinphoneManager.m
+++ b/Classes/LinphoneUI/LinphoneManager.m
@@ -597,7 +597,7 @@ void networkReachabilityCallBack(SCNetworkReachabilityRef target, SCNetworkReach
 		ms_warning("Disable video for phones prior to iPhone 3GS");
 	}
 	bool enableSrtp = [[NSUserDefaults standardUserDefaults] boolForKey:@"enable_srtp_preference"];
-	linphone_core_set_media_encryption(theLinphoneCore, enableSrtp?LinphoneMediaEncryptionSRTP:LinphoneMediaEncryptionNone);
+	linphone_core_set_media_encryption(theLinphoneCore, enableSrtp?LinphoneMediaEncryptionSRTP:LinphoneMediaEncryptionZRTP);
 	
 	UIDevice* device = [UIDevice currentDevice];
 	bool backgroundSupported = false;
diff --git a/linphonerc b/linphonerc
index eee6763a7..c494f1303 100644
--- a/linphonerc
+++ b/linphonerc
@@ -20,6 +20,7 @@ default_proxy=-1
 register_only_when_network_is_up=1
 auto_net_state_mon=0
 keepalive_period=30000
+media_encryption=zrtp
 
 [rtp]
 audio_rtp_port=7076