Cisco mra flow

[Toss Leey]

Can anyone tell me the media flow and signal flow for call between jabber mra user on internet and cube from patn

[Nithin Eluvathingal · Accepted solution]

The call signaling and media path are explained in the diagram below for a call from Jabber to an internal device. If the call is towards the PSTN through the CUBE, instead of the media flowing to the internal endpoint marked in the diagram, it will flow through the CUBE to the PSTN.

[Toss Leey]

So media flow will be expE--expC--Cube as diagram, but can we make it expE--Cube without pass to expC?

[Roger Kallberg]

The answer to that is No. Let me ask you how do you recon that this would operate? Your SBC has an internal interface that the media would flow through, how would the E be capable of communicating directly with it?

[Toss Leey]

I can do routing between them ;

[Roger Kallberg]

That would in reality make the whole thing with firewall traversal meaningless, wouldn’t it? The role of the E is to send traffic to the C via the tunnel that is initiated by the C to E. The E does not have the capability to handle media traffic.

[Nithin Eluvathingal]

No, you can’t do that. For the internal network, the traffic comes from the C server, and they are unaware of the E server and don’t need to know about it.

You need to understand how the Expressway C and E combinations work. @Roger Kallberg  explained it in a nutshell in his last response.