解决电话在振铃后应答但呼叫未连接的情况。了解通过NAT的SIP信令如何导致此问题以及启用严格代理如何帮助恢复正常呼叫建立。
本文解释了一个常见问题:被叫方电话振铃后接听,但未建立音频。被叫方进入通话状态且通话计时器开始计时,而主叫方继续听到回铃音。
这适用于本公司所有型号的电话。
本文档适用于负责排查电话相关问题的日常维护人员。
被叫电话接听后,会向主叫方返回200 OK消息。电话将其SIP响应发送到原始请求的VIA头中所携带的地址。在某些部署中,PBX位于私有网络并通过NAT映射暴露于公共网络,但PBX发送的SIP消息在VIA字段中仍然包含私有IP地址。结果,当电话发送其响应时,消息无法正确传递到远端。
在电话配置页面上启用“Strict Proxy”功能(中文显示为“兼容特殊服务器”)。启用此功能后,电话将不再向VIA头中的地址发送SIP响应,而是直接将响应发送到SIP Contact字段中指定的地址。
以下是在电话上启用“Strict Proxy”的方法。本文档以X3SG Pro为例:
登录电话的网页管理页面,然后进入“线路” - “高级设置” - 勾选“Strict Proxy”,并点击页面底部的提交,如下图所示。
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