So CUBE gives the ability to have either Media Flow-Through or Media Flow-Around. I think I have a good handle on what the difference between the two is but what are some real-world reasons as to one would be preferred over another?
Media flow through is used to support many of the features available like IP address translation and IP address hiding. Media flow around allows the CUBE greater scalability in the number of calls that can be processed by one CUBE router.
Inband DTMF relay means that DTMF digits will be sent in the media path between endpoints using different RTP payload type to be distinguished from the actual media stream.
For example, G729 uses RTP PT as 18 while NSE DTMF relay uses by default RTP PT as 96.
Outband DTMF relay signals DTMF digits using the signaling protocol (H323, SIP, MGCP). This isn't typically used when SCCP phones are deployed as SCCP phones don't recognize inband DTMF (you MTP to get SCCP working with inband DTMF)
Media flow-around terminates the signaling stream and allows RTP streams to flow directly between endpoints. F. Media flow-through provides address hiding by terminating both signaling and RTP streams.
Media flow through and media flow around mode is supported on the Cisco Unified Border Element (CUBE). The CUBE is always involved in the call setup (signaling) portion of the call, but the media (RTP bearer stream) may flow through the CUBE or be routed around the platform.
Media flow around allows the CUBE greater scalability in the number of calls that can be processed by one CUBE router.
For Media flow through option, the media packets are passed through the CUBE, they will get terminated and re-originates with CUBE’s IP address and port number, so here we cannot find the original gateway’s ip address. This is one of the security feature in the CUBE. The default option is “media flow-through”.
In real life I think it is down to scalability. The fact that media doesnt pass through CUBE in flow around means that CUBE can process more calls (CPU, memory etc)..
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