--- app_confbridge.c	(revision 319022)
+++ app_confbridge.c	(working copy)
@@ -1305,6 +1305,12 @@
 		ast_autoservice_start(chan);
 		play_sound_file(conference_bridge, join_sound);
 		ast_autoservice_stop(chan);
+                /* restart MOH if user is alone */
+		ao2_lock(conference_bridge);
+		if (conference_bridge->users == 1 && ast_test_flag(&conference_bridge_user.u_profile, USER_OPT_MUSICONHOLD)) {
+			ast_moh_start(chan, conference_bridge_user.u_profile.moh_class, NULL);
+		}
+		ao2_unlock(conference_bridge);
 	}
 
 	/* Join our conference bridge for real */