anchor.diff:                                     {'content-language', <<"en">>}, {'content-length', <<"5">>},
                                      {'content-type', <<"application/sdp">>}, {'cseq', <<"123 INVITE">>},
                                      {'date', <<"Sat, 13 Nov 2010 23:29:00 GMT">>}, {'error-info', <<"<sip:not-in-service-recording@atlanta.com>">>},
  +                                   {'expires', <<"213">>},
   
   
                                      {'content-length', <<"5">>}, {'via', <<"SIP/2.0/UDP localhost">>},
  
positive.code:                      "Content-Disposition: session\r\nContent-Encoding: gzip\r\n",
                       "Content-Language: en\r\nContent-Length: 5\r\n",
                       "Content-Type: application/sdp\r\nCSeq: 123 INVITE\r\n",
                       "Date: Sat, 13 Nov 2010 23:29:00 GMT\r\nError-Info: <sip:not-in-service-recording@atlanta.com>\r\n"
  
                       "Content-Length: 5\r\nVia: SIP/2.0/UDP localhost\r\nFrom: sip:alice@localhost\r\n",
                       "To: sip:bob@localhost\r\n"
  
negative.code:                    parse('error-info', <<"<sip:not-in-service-recording@atlanta.com>;param=\"value\"">>)),
       ?_assertEqual(<<"<sip:not-in-service-recording@atlanta.com>;param=value">>,
                     format('error-info', [info(<<"sip:not-in-service-recording@atlanta.com">>, [{param, <<"value">>}])])),
  
       % Expires
       ?_assertEqual(213, parse('expires', <<"213">>)),
       ?_assertEqual(<<"213">>, format('expires', 213)),
  
  
  
       % Max-Forwards
       ?_assertEqual(70, parse('max-forwards', <<"70">>)),
  