anchor.diff:      "start inbound";
   get_type(#twilio{direction = "inbound", call_status = "in-progress",
                    called = C, caller = Cr, from = Fr, to = To,
  -                call_duration = null, inprogress = Ip, recording = Rc} = Tw)
  +                call_duration = null, inprogress = Ip, recording = Rc})
     when C =/= null andalso Cr =/= null andalso Fr =/= null andalso To =/= null
          andalso Ip =/= null andalso Rc =/= null ->
       "in-progress recording notification";
  
positive.code:     prefix_to_country_code(Prefix);
  prefix_to_country_code("+" ++ Prefix) ->
      prefix_to_country_code(Prefix);
  prefix_to_country_code(Prefix) when is_integer(Prefix) ->
      prefix_to_country_code(integer_to_list(Prefix));
  prefix_to_country_code(Prefix) ->
      {_Country, CC, Prefix} = lists:keyfind(Prefix, 3, ?CCLOOKUP),
      CC.
  
negative.code:     prefix_to_country(Prefix);
  prefix_to_country("+" ++ Prefix) ->
      prefix_to_country(Prefix);
  prefix_to_country(Prefix) when is_list(Prefix) ->
      prefix_to_country(list_to_integer(Prefix));
  prefix_to_country(Prefix) ->
      {Country, _CC, Prefix} = lists:keyfind(Prefix, 3, ?CCLOOKUP),
      Country.
  