pjsip2.7.2版本，支持G729协议。与毅行设备对接。采用但是G711协议
http://www.pjsip.org/docs/book-latest/html/index.html
allprojects {
repositories {
...
maven { url 'https://jitpack.io' }
}
}
dependencies {
implementation 'com.github.stf-android:PJSIPAndroid:1.0.0'
}