anchor.diff:                                     {'date', <<"Sat, 13 Nov 2010 23:29:00 GMT">>}, {'error-info', <<"<sip:not-in-service-recording@atlanta.com>">>},
                                      {'expires', <<"213">>}, {'from', <<"sip:alice@localhost">>},
                                      {'in-reply-to', <<"70710@saturn.bell-tel.com, 17320@saturn.bell-tel.com">>}, {'max-forwards', 70},
  -                                   {'min-expires', <<"213">>},
  +                                   {'min-expires', <<"213">>}, {'mime-version', <<"1.0">>},
   
   
                                      {'content-length', <<"5">>}, {'via', <<"SIP/2.0/UDP localhost">>},
  
positive.code:      % Min-Expires
       ?_assertEqual(213, parse('min-expires', <<"213">>)),
       ?_assertEqual(<<"213">>, format('min-expires', 213)),
  
  
  
  
negative.code:                      "Date: Sat, 13 Nov 2010 23:29:00 GMT\r\nError-Info: <sip:not-in-service-recording@atlanta.com>\r\n",
                       "Expires: 213\r\nFrom: sip:alice@localhost\r\n",
                       "In-Reply-To: 70710@saturn.bell-tel.com, 17320@saturn.bell-tel.com\r\nMax-Forwards: 70\r\n",
                       "Min-Expires: 213\r\nMIME-Version: 1.0\r\n",
  
                       "Content-Length: 5\r\nVia: SIP/2.0/UDP localhost\r\n",
                       "To: sip:bob@localhost\r\n"
  