IntroductionOverviewAfter被叫電話接聽電話,沒有聽到音頻。
被叫電話接聽來電後,聽不到任何聲音。此時,被叫電話進入通話狀態並開始計時通話時長,而主叫電話仍聽到回鈴音。
這適用於本公司提供的所有電話型號。
本文檔適用於遇到此問題的所有客戶。
被叫方摘機後,電話會向主叫方發送200 OK訊息。該回應訊息被發送到原始SIP請求的VIA欄位中所攜帶的地址。在某些部署中,PBX位於私有網路並通過NAT映射到公網,但PBX發送的SIP訊息在VIA欄位中仍然包含私有IP地址。結果,電話的回應訊息無法正確傳遞到對端設備。
啟用電話設定中的「Strict proxy」功能(中文選項:「相容特殊伺服器」)。啟用此功能後,電話將不再向VIA標頭中的地址發送回應訊息,而是直接將其發送到SIP Contact欄位中指定的地址。
如何啟用電話的「特殊伺服器相容性」選項:
登錄電話的WEB管理頁面,然後點擊「線路」 - 「進階設定」 -- 勾選「設定特殊伺服器相容性」 - 點擊頁面底部的提交,如下圖所示。

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