We have devices and also VMware appliance that will produce RTP and/or PCM streams of live audio. https://easyonhold.com/integrations/cisco - Cisco Compatible Cert.
We make a device that receives a stream and provides RTP for your multicast use. We have just added a way to receive a stream from the cloud on a known port, then forward to our software on your VM that will make multiple streams in RTP available for...