1、因为对方正开发者_开发知识库在使用手机摄像头或者正在通话中。2、微信视频通话选择语音通话时，只需要使用手机的通话，录音功能。如果对方正在使用通话，录音功能，就会启用失败，无法连接，类似打电话占线。[详细]
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