iphonex ios12.1拨打语音输出如下 ,对方接通既挂断 ，日志如下
2018-11-21 13:56:12.061549+0800 FyhNewProj[11883:3115498] Reachability Flag Status: -R ------- networkStatusForFlags
2018-11-21 13:56:12.302529+0800 FyhNewProj[11883:3114701] Metal GPU Frame Capture Enabled
2018-11-21 13:56:12.320535+0800 FyhNewProj[11883:3114701] Metal API Validation Enabled
2018-11-21 13:56:13.274155+0800 FyhNewProj[11883:3115247] [avas] AVAudioSessionPortImpl.mm:56:ValidateRequiredFields: Unknown selected data source for Port 扬声器 (type: Speaker)
2018-11-21 13:56:13.274553+0800 FyhNewProj[11883:3115247] [avas] AVAudioSessionPortImpl.mm:56:ValidateRequiredFields: Unknown selected data source for Port 接收器 (type: Receiver)
2018-11-21 13:56:17.446565+0800 FyhNewProj[11883:3115247] [avas] AVAudioSessionPortImpl.mm:56:ValidateRequiredFields: Unknown selected data source for Port 接收器 (type: Receiver)
2018-11-21 13:56:17.450532+0800 FyhNewProj[11883:3115247] [avas] AVAudioSessionPortImpl.mm:56:ValidateRequiredFields: Unknown selected data source for Port 扬声器 (type: Speaker)
2018-11-21 13:56:17.451185+0800 FyhNewProj[11883:3115247] [avas] AVAudioSessionPortImpl.mm:56:ValidateRequiredFields: Unknown selected data source for Port 扬声器 (type: Speaker)
通过与融云技术客服交流，最终是sdk未更新导致，但是我下载官网的也不行，最终问他单独要了下载链接解决，下载地址：http://downloads.rongcloud.cn/RongCloudRTC_iOS_SDK_2.9.7_Stable.zip
