anchor.diff:  
       % Method not allowed
       {ok, 405, []} = nksip_uac:register(Client2, "sip:127.0.0.1:5070", []),
  -
  -    {ok, 400, []} = nksip_uac:register(Client1, "sip:127.0.0.1", 
  -                        [{from, "sip:one"}, {to, "sip:two"}]),
   
       {ok, 200, Values1} = nksip_uac:register(Client1, "sip:127.0.0.1", 
                           [unregister_all, {fields, [<<"Contact">>]}]),
  
positive.code:     {ok, 200, []} = nksip_uac:register(Client1, 
                                              "<sip:127.0.0.1;transport=tls>", Opts1),
      {ok, 200, []} = nksip_uac:register(Client1, "sips:127.0.0.1", Opts1),
  
      {ok, 400, []} = nksip_uac:register(Client1, "sip:127.0.0.1", Opts2),
      {ok, 200, Values3} = nksip_uac:register(Client1, "sips:127.0.0.1", 
                          [{contact, <<"<sips:client1@127.0.0.1:5071>">>},
                           {fields, [<<"Contact">>]}
  
negative.code:         #uri{scheme=sip, port=5070, opts=[], ext_opts=[{expires, <<"300">>}]},
          #uri{scheme=sip, port=5070, opts=[{transport, <<"tcp">>}], 
                                                  ext_opts=[{expires, <<"300">>}]},
          #uri{scheme=sip, port=5071, opts=[{transport, <<"tls">>}], 
                                                  ext_opts=[{expires, <<"300">>}]},
          #uri{scheme=sips, port=5071, opts=[], ext_opts=[{expires, <<"300">>}]},
          #uri{scheme=tel, domain=(<<"123456">>), opts=[], ext_opts=[{expires, <<"300">>}]}
      ]  = lists:sort(Contacts4),
  
      [#uri{scheme=sips, port=5071, opts=[], ext_opts=[{expires, <<"300">>}]}] = 
  