anchor.diff:          user = <<"ua1">>, domain = <<"127.0.0.1">>, port = 5101, 
           opts = [{<<"transport">>, <<"tcp">>}, <<"ob">>],
           headers = [{<<"Route">>, QRoute1}],
  -        ext_opts = [{<<"+sip.instance">>, QInstanceC1}, {<<"expires">>,<<"3600">>}]
  +        ext_opts = EOpts2
       }=Contact1] = nksip_registrar:find(R1, sip, <<"ua1">>, <<"nksip">>),
  +    true = lists:member({<<"+sip.instance">>, QInstanceC1}, EOpts2),
   
       true = 
           list_to_binary(http_uri:decode(binary_to_list(QRoute1))) == 
  
positive.code:                             [make_contact, {reg_id, 2}, {fields, [parsed_contacts]}]),
      [
          #reg_contact{
              index = {ob, QInstanceC1, <<"2">>},
              contact = Contact2,
              path = [#uri{user = <<"NkF", Flow1/binary>>}]
          },
          #reg_contact{
              index = {ob, QInstanceC2, <<"1">>},
              contact = Contact3,
              path = [#uri{user = <<"NkF", Flow2/binary>>}]
          },
          #reg_contact{
              index = {ob, QInstanceC1, <<"1">>},
              contact = Contact1,
              path = [#uri{user = <<"NkF", Flow1/binary>>}]
          }
  
negative.code: 
  -compile([export_all]).
  
  outbound_test_() ->
      {setup, spawn, 
          fun() -> start() end,
          fun(_) -> stop() end,
  