A media resource is a software-based or hardware-based entity that performs media processing functions on the data streams to which it is connected.
Media processing functions include;
- Mixing multiple streams to create one output stream (conferencing)
- Passing the stream from one connection to another, DTMF conversion (media termination point)
- Converting the data stream from one compression type to another (transcoding)
- Streaming music to callers on hold (music on hold)
- Echo cancellation, signaling & voice termination from a TDM circuit (MTP coding/decoding)
- Streaming audio (annunciation)
The software-based resources are provided by the Cisco Unified Communications Manager (Unified CM) IP Voice Media Streaming Service (IP VMS). Digital signal processor (DSP) cards provide both software and hardware based resources.
Each resource type has a defined device pool which in turn is configured with a Region, this region is important to consider for inter-region codes.