实现电话通话录音功能，监听到电话接通是启动录音，通话结束，录音完成，生成音频文件保存到数据库中，还可以扩展作为邮件发送,Telephone call recording function, listening to the phone is turned on to start recording, the end of the call, the recording is finished, generate audio files saved to the database, but also can be extended as a mailing