解決電話在振鈴後應答但呼叫未連接的情況。瞭解通過NAT的SIP信令如何導致此問題以及啓用嚴格代理如何幫助恢復正常呼叫建立。
本文解釋了一個常見問題:被叫方電話振鈴後接聽,但未建立音訊。被叫方進入通話狀態且通話計時器開始計時,而主叫方繼續聽到回鈴音。
這適用於本公司所有型號的電話。
本文檔適用於負責排查電話相關問題的日常維護人員。
被叫電話接聽後,會向主叫方返回200 OK訊息。電話將其SIP回應發送到原始請求的VIA標頭中所攜帶的地址。在某些部署中,PBX位於私有網路並通過NAT映射暴露於公共網路,但PBX發送的SIP訊息在VIA欄位中仍然包含私有IP地址。結果,當電話發送其回應時,訊息無法正確傳遞到遠端。
在電話配置頁面上啟用“Strict Proxy”功能(中文顯示為“兼容特殊伺服器”)。啟用此功能後,電話將不再向VIA標頭中的地址發送SIP回應,而是直接將回應發送到SIP Contact欄位中指定的地址。
以下是在電話上啟用“Strict Proxy”的方法。本文檔以X3SG Pro為例:
登錄電話的網頁管理頁面,然後進入“線路” - “進階設定” - 勾選“Strict Proxy”,並點擊頁面底部的提交,如下圖所示。
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