Webrtc does not listen from android on chromecast

I´m testing Licode webRTC and I want to send my videoconference screen to google Chromecast. However, when I cast the videoconference from my phone to my TV, the audio is not heard, but the video is transmitted on the screen but when I use my computer Google Chrome browser and I cast the tab, the video conference is heard without problems.
I´ve checked the audio compatibility and video codecs with Google Chrome and there should be work without problems , they are compatible because licode uses the video codecs vp8 and opus for audio in both are supported by Chromecast, but when I send it from my phone the audio is not heard on tv, only on the phone.
These are the references that I review:
Does anyone know why this happens?