Cisco MRA call flow

[Shan28]

Hi Guys,

Please help me to understand MRA call/media flow between 2 end points using different expressway cluster register using mra..
Refer docs if any.. 

[Nithin Eluvathingal]

How do you dial each other ?

[Shan28]

Hi Nitin, 

Consider both are in different cluster(2 different customers) having reachability only through pstn number.. 

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Shan

[Nithin Eluvathingal · Accepted solution]

Since  you  are calling  using  PSTN, the call flow will be as mentioned below.

PhoneA>>EXPR-E>>EXPR-C>>GATEWYA>>PSTN>>GATEWAYB>>EXPR-C>>EXPR-E>>PhoneB

Read the below document.

https://www.ciscolive.com/c/dam/r/ciscolive/us/docs/2019/pdf/BRKCOL-2000.pdf

[Jonas Fraga · Accepted solution]

Hello Shan28.

The default Media call flow without ICE implemented are as follows:

Client A <-> Exp-E_1 <-> Exp-C_1 <-> Exp-C_2 <-> Exp-E_2 <-> Client B

With ICE are just Client A <-> Client B

But Signaling following always this:

Client A <-> Exp-E_1 <-> Exp-C_1 <-> CUCM <-> Exp-C_2 <-> Exp-E_2 <-> Client B