Using CUBE to do IP Address overlap

[Arun Kalpathi Ganapathi]

Hi All

I have a client that want to use CUBE to sit between two CUCM clusters because they have overlapping IP address.  Has anyone heard of this before or know of a better way to deal with this situation?  If someone done this before can they share a sample configuration

Thanks

[Karthik Sivaram]

hi Arun,

Could you give a more detailed description of the exact problem?

Yes you can have a CUBE to sit between 2 clusters but why would you even need a CUBE for this ? Which ip addresses are overlapping ?

You could just have a direct sip trunk between 2 clusters or an ICT between 2 CUCM clusters.

Thanks,

Karthik

[Arun Kalpathi Ganapathi]

Hi

We have a customer with Cluster A and Cluster B going to CUBE then to SME.  Because they are using layer 2 MPLS VPN users on Cluster A can potentially use the same network address as Cluster B.  So the plan is to put CUBE in the middle to hide the address of Cluster A and Cluster B.  So when an IP Phone in Cluster A call IP Phone in Cluster B the RTP stream does not flow from A to B directly but go via the CUBE router.  I hope this make sense because I am confused when customer propose such a solution.  My also concern is none of the design for SME has SIP Trunk to CUBE.  Not sure whether SME to CUBE has any issues?

Thanks

[Karthik Sivaram]

hi Arun,

Here is what you will require:

1) Use NAT config on the cube to  hiding addresses ( private / public) 

2) By SME I am assuming you are referring to  Cisco Unified Communications Manager Session Management Edition. You can have

a topology similar to this to achieve your requirement

cluster>>>sip>>> CUBE >>>>sip>>>SME>>>sip>>>>cluster B

3) Session Mgmt Edition is a  sip B2BUA. For sip trunking to be done on the cube you can configure basic "sip dial peers" with your dialplan.

4) Also refer to the following links:

For other deployment/designs:

http://docwiki.cisco.com/wiki/Unified_Communications_Manager_-_Session_Manager_Edition

Also sample configurations are available here:

http://www.cisco.com/en/US/solutions/ns340/ns414/ns728/interOp_ucSessionMgr.html

Hope this Helps!

Thanks,

Karthik