anchor.diff:  	    proxy_request(THandler, Request, Loc, []);
   	{redirect, Loc} ->
   	    logger:log(normal, "~s: incomingproxy: Redirect ~s", [LogTag, sipurl:print(Loc)]),
  -	    Contact = [{none, Location}],
  +	    Contact = [{none, Loc}],
   	    ExtraHeaders = [{"Contact", sipheader:contact_print(Contact)}],
   	    transactionlayer:send_response_handler(THandler, 302, "Moved Temporarily", ExtraHeaders);
   	{relay, Loc} ->
  
positive.code: 			    transactionlayer:send_response_handler(THandler, Status, Reason);
  			{siperror, Status, Reason, ExtraHeaders} ->
  			    transactionlayer:send_response_handler(THandler, Status, Reason, ExtraHeaders);
  			_ ->
  			    true
  		    end;
  
negative.code:     transportlayer:send_proxy_request(none, Request, Request#request.uri, []);
  
  %%
  %% CANCEL or BYE
  %%
  %% These requests cannot be challenged, since they can't be resubmitted. Bypass
  %% check of authorized From: address
  request(Request, Origin, LogStr) when record(Request, request), record(Origin, siporigin), Request#request.method == "CANCEL"; Request#request.method == "BYE" ->
      do_request(Request, Origin);
  
  %%
  %% Request other than REGISTER, ACK, CANCEL or BYE
  %%
  request(Request, Origin, LogStr) when record(Request, request), record(Origin, siporigin) ->
      {_, FromURI} = sipheader:from(keylist:fetch("From", Request#request.header)),
  