diff --git a/samples/js/apprtc/apprtc.py b/samples/js/apprtc/apprtc.py
index 30dfb46d4a..8c5d3eafff 100644
--- a/samples/js/apprtc/apprtc.py
+++ b/samples/js/apprtc/apprtc.py
@@ -144,7 +144,7 @@ def make_media_stream_constraints(audio, video):
   logging.info('Applying media constraints: ' + str(stream_constraints))
   return stream_constraints
 
-def make_pc_constraints(compat):
+def make_pc_constraints(compat, dscp):
   constraints = { 'optional': [] }
   # For interop with FireFox. Enable DTLS in peerConnection ctor.
   if compat.lower() == 'true':
@@ -153,6 +153,11 @@ def make_pc_constraints(compat):
   # of compat is false for loopback mode.
   else:
     constraints['optional'].append({'DtlsSrtpKeyAgreement': False})
+
+  # DSCP for QoS support
+  if dscp.lower() == 'true':
+    constraints['optional'].append({'googDscp': True})
+
   return constraints
 
 def make_offer_constraints():
@@ -377,6 +382,9 @@ class MainPage(webapp2.RequestHandler):
       # Set compat to false as DTLS does not work for loopback.
       compat = 'false'
 
+    # Set DSCP for QoS support in WebRTC
+    dscp = self.request.get('dscp')
+
     # token_timeout for channel creation, default 30min, max 2 days, min 3min.
     token_timeout = self.request.get_range('tt',
                                            min_value = 3,
@@ -428,7 +436,7 @@ class MainPage(webapp2.RequestHandler):
     turn_url = turn_url + 'turn?' + 'username=' + user + '&key=4080218913'
     token = create_channel(room, user, token_timeout)
     pc_config = make_pc_config(stun_server, turn_server, ts_pwd)
-    pc_constraints = make_pc_constraints(compat)
+    pc_constraints = make_pc_constraints(compat, dscp)
     offer_constraints = make_offer_constraints()
     media_constraints = make_media_stream_constraints(audio, video)
     template_values = {'error_messages': error_messages,