Calls Between Two Air-Gapped Network

[abdul rasheed]

Hello Team,

We have a scenario to make calls between two different call manager clusters. Both the clusters are in two different air-gapped networks. And these clusters are serving 100s of sites. 

Cluster A hosted in DC1.

Cluster B hosted in DC2. 

Cluster A serving site A1 and Site A2.

Cluster B serving Site B1 and Site B2.

The only possible connection can provide is that the IP communications between two different DCs(between these two CM clusters). There will be no connection between the two branches served by the two clusters. It means there is no IP connectivity between A1 and B1 or A1 and B2.  

We need to allow the Calls between all the different branches: 

Ax to Ay (no challenge as they share the same IP routing domain).

Bx to By (no challenge as they share the same IP routing domain).

Ax to Bx  (  there is no IP connectivity between these).

Can we use the Expressway solution to build the B2B calls between these two clusters. 

The media also should traverse the Expressway as there is no routing between the different sites served by the clusters. 

There will be audio and video calls as well as video conferencing. 

Kindly advise on the possible solutions. 

[Roger Kallberg · Accepted solution]

I would recommend you to look into putting SBCs at the two DCs, to form a conneciton between the two networks. That will serve the signaling and media traffic as it acts as the connection between the networks with the traffic flowing through it. For example you could use a Cisco router and configure the Cube functionality on it to have it provide the Session Border Controller (SBC) function. With this the branches would not really need to know anything about the other side, as all the traffic would flow via the SBC.

[Nithin Eluvathingal · Accepted solution]

 @Roger Kallberg  mentioned would be the best option for your scenario.

[abdul rasheed]

Thanks Nithin

[abdul rasheed]

Thanks Roger

[abdul rasheed]

Hello Roger,

One clarification. Is it possible to use the same CUBE if both the clusters are in the same DC? 

[Roger Kallberg · Accepted solution]

Yes that’s possible. Just connect one interface in each of the networks.