【正文】 ..................... 49 處理 4xx應(yīng)答 ......................................................................................... 50 UAS特性 ............................................................................................................. 51 方法判定 ....................................................................................................... 52 包頭判斷 ....................................................................................................... 52 3 TO 和 RequestURI ............................................................................. 52 合并的請(qǐng)求 ............................................................................................... 53 Require ................................................................................................... 53 內(nèi)容處理 ....................................................................................................... 54 應(yīng)用擴(kuò)展 ....................................................................................................... 55 處理請(qǐng)求 ....................................................................................................... 55 產(chǎn)生應(yīng)答 ....................................................................................................... 55 發(fā)送一個(gè)臨時(shí)應(yīng)答 ................................................................................... 56 包頭和 Tags ............................................................................................ 56 無(wú)狀態(tài) UAS行為 ........................................................................................ 56 重定向服務(wù)器 ....................................................................................................... 57 9 取消一個(gè)請(qǐng)求 (Cancel).............................................................................................. 59 客戶(hù)行為 (Client Behavior) ............................................................................ 60 服務(wù)端行為 (Server Behavior)....................................................................... 61 10 注冊(cè) (Registrations) .............................................................................................. 62 概覽 .................................................................................................................... 62 構(gòu)造一個(gè) REGISTER請(qǐng)求 ............................................................................. 63 增加綁定 .................................................................................................... 65 設(shè)置 Contact 地址的過(guò)期參數(shù) ........................................................... 66 刪除綁定 .................................................................................................... 67 訪問(wèn)綁定 .................................................................................................... 67 刷新綁定 .................................................................................................... 68 設(shè)置內(nèi)部時(shí)鐘 ............................................................................................ 68 尋找注冊(cè)服務(wù)器 ........................................................................................ 68 傳送一個(gè)請(qǐng)求 ............................................................................................ 69 錯(cuò)誤響應(yīng) .................................................................................................... 69 處理 REGISTER請(qǐng)求 ..................................................................................... 69 11 查詢(xún)能力 .................................................................................................................... 72 構(gòu)造 OPTIONS請(qǐng)求 ........................................................................................ 73 處理 OPTIONS請(qǐng)求 ........................................................................................ 74 12 對(duì)話(huà) (Dialog) ............................................................................................................ 76 創(chuàng)建一個(gè)對(duì)話(huà) .................................................................................................... 77 UAS行為 ................................................................................................... 77 UAC行為 ................................................................................................... 78 對(duì)話(huà)中的請(qǐng)求 .................................................................................................... 79 UAC行為 ................................................................................................... 80 產(chǎn)生請(qǐng)求 ................................................................................................ 80 處理應(yīng)答 ................................................................................................ 82 UAS行為 ................................................................................................... 83 終止對(duì)話(huà) ............................................................................................................ 84 13 初始化一個(gè)會(huì)話(huà) ........................................................................................................ 84 4 概覽 .................................................................................................................... 84 UAC處理 ........................................................................................................... 85 創(chuàng)建一個(gè)初始化的 INVITE ..................................................................... 85 處理 INVITE應(yīng)答 .................................................................................... 88 1xx應(yīng)答 ................................................................................................ 88 3xx應(yīng)答 ................................................................................................ 88 4xx,5xx,6xx應(yīng)答 .............................................................................. 89 2xx 應(yīng)答 ............................................................................................... 89 UAS處理 ............................................