【正文】 Request ................................................................................ 207 401 Unauthorized .............................................................................. 207 402 Payment Required .................................................................... 208 403 Forbidden ..................................................................................... 208 404 Not Found .................................................................................... 208 405 Method Not Allowed ................................................................. 208 406 Not Acceptable ........................................................................... 208 407 Proxy Authentication Required ............................................ 208 408 Request Timeout ....................................................................... 209 410 Gone ............................................................................................ 209 413請求實體過大。 ........................................................................... 209 414 RequestURI Too Long ......................................................... 209 415 Unsupported Media Type..................................................... 210 416 Unsupported URI Scheme................................................... 210 Bad Extension ................................................................................... 210 421Extension Required ................................................................. 210 423 Interval Too Brief ................................................................... 210 480 Temporarily Unavailable ...................................................... 211 481 Call/Transaction Does Not Exist ....................................... 211 482 Loop Detected.......................................................................... 211 483 Too Many Hops........................................................................ 211 484 Address InComplete .............................................................. 212 485 Ambiguous ................................................................................ 212 486 Busy Here .................................................................................. 212 487 Request Terminated .............................................................. 213 488 Not Acceptable Here.............................................................. 213 491 Request Pending ..................................................................... 213 493 Undecipherable........................................................................ 213 Server Failure 5xx ..................................................................................... 213 500 Server Internal Error ............................................................... 214 501 Not Implemented ...................................................................... 214 502 Bad Gateway............................................................................... 214 503 Service Unavailable.................................................................. 214 504 Server Timeout ........................................................................ 215 505 Version Not Supported ........................................................... 215 Message To Large .............................................................................. 215 Global Failures 6xx .................................................................................... 215 600 Busy Everywhere ...................................................................... 215 8 603 Decline .......................................................................................... 216 604 Does Not Exists Anywhere .................................................... 216 606 Not Acceptable ........................................................................... 216 22 使用 HTTP認證 ...................................................................................................... 217 框架 .................................................................................................................. 217 用戶到用戶的認證。 ...................................................................................... 220 Proxy到用戶的認證 ...................................................................................... 221 Digest 認證方案 ............................................................................................ 224 23 S/MIME................................................................................................................... 226 S/MIME 認證 ................................................................................................. 226 S/MIME 密鑰交換 ......................................................................................... 227 加密 MIME 包體 ............................................................................................. 230 SIP頭隱私和用 S/MIME的完整性： SIP地道 ......................................... 232 SIP頭的完整性和機密屬性 .................................................................. 233 完整性 .................................................................................................. 233 機密性 .................................................................................................. 233 隧道的完整性和身份認證 ...................................................................... 235 隧道加密 .................................................................................................. 238 24 例子 .......................................................................................................................... 241 注冊 .................................................................................................................. 241 建立會話 .........................................................................