【正文】 Require ........................................................................................................ 196 RetryAfter ................................................................................................. 196 Route ............................................................................................................ 197 Server .......................................................................................................... 197 Subject ........................................................................................................ 197 Supported................................................................................................... 198 Timestamp ................................................................................................. 198 To................................................................................................................... 198 Unsupported .............................................................................................. 199 UserAgent ................................................................................................. 199 Via ................................................................................................................. 199 警告 ................................................................................................................ 201 WWWAuthenticate ................................................................................ 203 21 應(yīng)答代碼 .................................................................................................................. 204 臨時(shí)應(yīng)答 1xx .................................................................................................. 204 100 Trying ............................................................................................ 204 180 Ringing .......................................................................................... 204 818 Call is Being Forwarded(呼叫被轉(zhuǎn)發(fā) ) .................................. 204 182 Queued.......................................................................................... 205 183 會(huì)話(huà)進(jìn)度 ......................................................................................... 205 成功信息 2xx .................................................................................................. 205 200 OK ................................................................................................... 205 轉(zhuǎn)發(fā)請(qǐng)求 3XX ................................................................................................. 205 7 300 Multiple Choices......................................................................... 205 301 Moved Permanently ................................................................. 206 302 Moved Temporarily................................................................... 206 305 Use Proxy ..................................................................................... 207 380 Alternative Service ................................................................... 207 請(qǐng)求失敗 4xx .................................................................................................. 207 400 Bad 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(qǐng)求實(shí)體過(guò)大。 ...................................................................................... 220 Proxy到用戶(hù)的認(rèn)證 ...................................................................................... 221 Digest 認(rèn)證方案 ............................................................................................ 224 23 S/MIME................................................................................................................... 226 S/MIME 認(rèn)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(jī)密屬性 .................................................................. 233 完整性 .................................................................................................. 233 機(jī)密性 .................................................................................................. 233 隧道的完整性和身份認(rèn)證 ...................................................................... 235 隧道加密 .................................................................................................. 238 24 例子 .......................................................................................................................... 241 注冊(cè) .................................................................................................................. 241 建立會(huì)話(huà) ........................................................................