anchor.diff:  
   process(f, 'accept-language', Accept) when is_record(Accept, sip_hdr_language) ->
       LangBin = sip_syntax:format_name(Accept#sip_hdr_language.language),
  -    append_params(LangBin, Accept#sip_hdr_language.params);
  +    format_params(LangBin, Accept#sip_hdr_language.params);
   
   %% 20.4 Alert-Info
   %% http://tools.ietf.org/html/rfc3261#section-20.4
  
positive.code: process(f, 'call-info', Info) when is_record(Info, sip_hdr_info) ->
      URI = sip_uri:format(Info#sip_hdr_info.uri),
      Bin = <<?LAQUOT, URI/binary, ?RAQUOT>>,
      append_params(Bin, Info#sip_hdr_info.params);
  
  %% 20.10 Contact
  %% http://tools.ietf.org/html/rfc3261#section-20.10
  
negative.code: 
  process(f, 'content-disposition', Disp) when is_record(Disp, sip_hdr_disposition) ->
      TypeBin = sip_syntax:format_name(Disp#sip_hdr_disposition.type),
      format_params(TypeBin, Disp#sip_hdr_disposition.params);
  
  %% 20.12 Content-Encoding
  %% http://tools.ietf.org/html/rfc3261#section-20.12
  