diff --git a/synapse/rest/client/voip.py b/synapse/rest/client/voip.py
new file mode 100644
index 0000000000..f53020520d
--- /dev/null
+++ b/synapse/rest/client/voip.py
@@ -0,0 +1,73 @@
+# Copyright 2014-2016 OpenMarket Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import base64
+import hashlib
+import hmac
+
+from synapse.http.servlet import RestServlet
+from synapse.rest.client._base import client_patterns
+
+
+class VoipRestServlet(RestServlet):
+ PATTERNS = client_patterns("/voip/turnServer$", v1=True)
+
+ def __init__(self, hs):
+ super().__init__()
+ self.hs = hs
+ self.auth = hs.get_auth()
+
+ async def on_GET(self, request):
+ requester = await self.auth.get_user_by_req(
+ request, self.hs.config.turn_allow_guests
+ )
+
+ turnUris = self.hs.config.turn_uris
+ turnSecret = self.hs.config.turn_shared_secret
+ turnUsername = self.hs.config.turn_username
+ turnPassword = self.hs.config.turn_password
+ userLifetime = self.hs.config.turn_user_lifetime
+
+ if turnUris and turnSecret and userLifetime:
+ expiry = (self.hs.get_clock().time_msec() + userLifetime) / 1000
+ username = "%d:%s" % (expiry, requester.user.to_string())
+
+ mac = hmac.new(
+ turnSecret.encode(), msg=username.encode(), digestmod=hashlib.sha1
+ )
+ # We need to use standard padded base64 encoding here
+ # encode_base64 because we need to add the standard padding to get the
+ # same result as the TURN server.
+ password = base64.b64encode(mac.digest()).decode("ascii")
+
+ elif turnUris and turnUsername and turnPassword and userLifetime:
+ username = turnUsername
+ password = turnPassword
+
+ else:
+ return 200, {}
+
+ return (
+ 200,
+ {
+ "username": username,
+ "password": password,
+ "ttl": userLifetime / 1000,
+ "uris": turnUris,
+ },
+ )
+
+
+def register_servlets(hs, http_server):
+ VoipRestServlet(hs).register(http_server)
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