I'm setting up a call-in line to listen to to streaming audio.

On this particular setup, there's no options - no dtmf, nothing at all for the user to do other than listen or hang up.

So can I disable the RTP on the leg from the caller to my server, to not waste bandwidth? (Although it's inbound, so I don't actually pay for that.) e.g. can I set MY inbound RTP ip/port to null?

Even if FS supports this, will this possibly not play well with the carrier?

Thanks!