Join API by participant's Audio or Video stream

[streamoso]

I was looking for way to support Video Conferencing over Moho/Rayo framework using other kind of Media Server that has JSR-309 API supported. However, is it possible to define specific type of media channel for Join API, such as Audio or Video channels.

For example, we can set media (DIRECT or BRIDGE) and direction (duplex, Recv, Send)... But, can't we do the same for JoinableStream Call-type like Video or Audio separately?