簡介概述電話響後和被叫方
電話振鈴且被叫方應答後，通話建立並正常通話。當被叫方掛斷電話時，電話返回到空閒狀態。但是，主叫方仍然保持在通話狀態，無法自動結束通話。
本公司所有型號的IP電話。
本文檔適用於遇到此問題的所有用戶。
被叫方掛斷電話時，電話會主動向主叫方發送BYE訊息以請求終止通話。電話將請求訊息發送到先前收到的訊息的VIA標頭中包含的地址。在某些網路部署中，PBX位於內部網路，但通過NAT映射到公共網路。這類PBX發送的SIP訊息在VIA標頭中包含私有IP地址。結果，電話無法將後續請求訊息正確傳送到對端，導致無法掛斷通話。
啟用電話配置中的「直接聯繫」功能，允許電話直接將請求訊息發送到對端Contact標頭中指定的地址。請按照以下步驟操作：
登錄電話的網頁界面，導航至系統 > 系統配置，右鍵點擊並選擇連結另存為...將配置文件保存為config.txt。
打開config.txt文件，使用Ctrl+F搜索關鍵字Direct Contact。將SIP1 Direct Contact :0和SIP2 Direct Contact :0的值分別改為SIP1 Direct Contact :1和SIP2 Direct Contact :1，然後保存文件。
再次登錄電話的網頁界面，進入系統 > 系統配置 > 導入配置。點擊選擇文件，選擇修改後的config.txt文件，然後點擊導入。電話將自動重啟以完成配置更新。
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