Adding IceConfig option to assume TURN/TURN candidate pairs will work.

webrtc/p2p/base/portinterface.h

 /*
  *  Copyright 2012 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 48 matching lines @@
   // clients can send to.  It may take some time before the address is ready.
   // Once it is ready, we will send SignalAddressReady.  If errors are
   // preventing the port from getting an address, it may send
   // SignalAddressError.
   virtual void PrepareAddress() = 0;
 
   // Returns the connection to the given address or NULL if none exists.
   virtual Connection* GetConnection(
       const rtc::SocketAddress& remote_addr) = 0;
 
-  // Creates a new connection to the given address.
+  // Creates a new connection to the given address with the given ICE config.
   enum CandidateOrigin { ORIGIN_THIS_PORT, ORIGIN_OTHER_PORT, ORIGIN_MESSAGE };
-  virtual Connection* CreateConnection(
-      const Candidate& remote_candidate, CandidateOrigin origin) = 0;
+  virtual Connection* CreateConnection(const Candidate& remote_candidate,
+                                       CandidateOrigin origin,
+                                       const IceConfig& config) = 0;
 
   // Functions on the underlying socket(s).
   virtual int SetOption(rtc::Socket::Option opt, int value) = 0;
   virtual int GetOption(rtc::Socket::Option opt, int* value) = 0;
   virtual int GetError() = 0;
 
   virtual const std::vector<Candidate>& Candidates() const = 0;
 
   // Sends the given packet to the given address, provided that the address is
   // that of a connection or an address that has sent to us already.
@@ skipping 40 matching lines @@
 
   virtual std::string ToString() const = 0;
 
  protected:
   PortInterface() {}
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_PORTINTERFACE_H_