diff --git a/sylk/applications/webrtcgateway/push.py b/sylk/applications/webrtcgateway/push.py
index b426b8b..71f3c63 100644
--- a/sylk/applications/webrtcgateway/push.py
+++ b/sylk/applications/webrtcgateway/push.py
@@ -1,93 +1,93 @@
 
 import json
 
 from twisted.internet import defer, reactor
 from twisted.web.client import Agent, readBody
 from twisted.web.iweb import IBodyProducer
 from twisted.web.http_headers import Headers
 from zope.interface import implementer
 
 from .configuration import GeneralConfig
 from .logger import log
 from .models import sylkpush
 from .storage import TokenStorage
 
 
 __all__ = 'conference_invite'
 
 
 agent = Agent(reactor)
 headers = Headers({'User-Agent': ['SylkServer'],
                    'Content-Type': ['application/json']})
 
 
 @implementer(IBodyProducer)
 class StringProducer(object):
     def __init__(self, data):
         self.body = data
         self.length = len(data)
 
     def startProducing(self, consumer):
         consumer.write(self.body)
         return defer.succeed(None)
 
     def pauseProducing(self):
         pass
 
     def stopProducing(self):
         pass
 
 def _construct_and_send(result, request, destination):
     for device_token, push_parameters in result.iteritems():
         request.token = device_token
         request.app_id = push_parameters['app']
         request.platform = push_parameters['platform']
         request.device_id = push_parameters['device_id']
         _send_push_notification(request, destination)
 
 def conference_invite(originator, destination, room, call_id, audio, video):
     tokens = TokenStorage()
     if video:
-        media_type = video
+        media_type = 'video'
     else:
-        media_type = audio
+        media_type = 'audio'
 
     request = sylkpush.ConferenceInviteEvent(token='dummy', app_id='dummy', platform='dummy', device_id='dummy',
                                              originator=originator.uri, from_display_name=originator.display_name, to=room, call_id=str(call_id),
                                              media_type=media_type)
     user_tokens = tokens[destination]
     if isinstance(user_tokens, set):
         return
     else:
         if isinstance(user_tokens, defer.Deferred):
             user_tokens.addCallback(lambda result: _construct_and_send(result, request, destination))
         else:
             _construct_and_send(user_tokens, request, destination)
 
 
 @defer.inlineCallbacks
 def _send_push_notification(payload, destination):
     if GeneralConfig.sylk_push_url:
         try:
             r = yield agent.request('POST', GeneralConfig.sylk_push_url, headers, StringProducer(json.dumps(payload.__data__)))
         except Exception as e:
             log.info('Error sending push notification to %s: %s', GeneralConfig.sylk_push_url, e)
         else:
             if r.code != 200:
                 if r.code == 410:
                     try:
                         body = yield readBody(r)
                     except Exception as e:
                         log.warning('Error reading response body: %s', e)
                     else:
                         if 'application/json' in r.headers.getRawHeaders('content-type'):
                             token = json.loads(body)['data']['token']
                             log.info('Token expired, purging old token from storage')
                             tokens = TokenStorage()
                             tokens.remove(destination, token)
                 else:
                     log.warning('Error sending push notification: %s', r.phrase)
             else:
                 log.info('Sent push notification: %s', payload)
     else:
         log.warning('Cannot send push notification: no Sylk push server configured')