RTPENGINE required or not

[jinucompute]

I am new to setting up the SBC. I have installed it successfully and launched the web ui. I am using the docker container to host this. I have one docker container for LibreSBC and one for Redis. My confusion is do i need another docker container hosting RTPENGINE. I am not sure if i choose media_mode as proxy then do i need to deploy RTPENGINE container separately ?