anchor.diff:                                     {'authorization', <<"Digest username=\"Alice\"">>}, {'call-id', <<"callid">>},
                                      {'call-info', <<"<http://www.example.com/alice/photo.jpg>">>}, {'contact', <<"*">>},
                                      {'content-disposition', <<"session">>}, {'content-encoding', gzip},
  -                                   {'content-language', 'en'},
  +                                   {'content-language', 'en'}, {'content-length', 5},
   
                                      {'content-length', <<"5">>}, {'via', <<"SIP/2.0/UDP localhost">>},
                                      {'from', <<"sip:alice@localhost">>}, {'to', <<"sip:bob@localhost">>},
  
positive.code:     append_params(TypeBin, Disp#sip_hdr_disposition.params);
  
  %% 20.12 Content-Encoding
  process(pn, <<"e">>, _Ignore) -> 'content-encoding';
  process(fn, 'content-encoding', _Ignore) -> <<"Content-Encoding">>;
  process(p, 'content-encoding', Bin) ->
  
negative.code:      ?_assertEqual(<<"en, en-us-some">>,
                     format('content-language', [en, 'en-us-some'])),
  
       % Content-Length
       ?_assertEqual(32543523, parse('content-length', <<"32543523">>)),
       ?_assertEqual(<<"98083">>, format('content-length', 98083)),
  
  
  
  
  
  
  
  
       % CSeq
       ?_assertEqual(cseq(1231, 'ACK'), parse('cseq', <<"1231 ACK">>)),
  