Need help for the express way design

[csco11063007]

Dears,

We have scenario of One CUCM CLuster & One IM & P Cluster at Site 1 and another CUCM and IM P CLsuter at Site 2.

All 4 clusters are served by a single AD domain but users at each site are grouped in the AD Security Group & sync with relevant cluster.

We want to deploy MRA using Expressway at Each site. We wanted to connect  users at Site 1 to use expressway at Site 1 & users at Site 2 to expressway at Site 2.

Can you please help how can we achieve the design using single email address domain,

Thanks in Advance.

Thomas

[Dennis Mink]

somewhere this is gonna bite you in the back, but anyway you must have your reasons for wanting this.

Set it up as you suggest two expressway/control clusters, each pointing to their own CUCM cluster.

on your VCS control each will then have a pattern:

(.*)@yourcompany.com(.*)

  pointing to their respective cucm clusters (so site 1  VCS  > Site 1 CUCM etc.), so far so good.  

I think for the communications bewteeen the two CUCM cluster, you will need to have a look at ILS:

https://supportforums.cisco.com/document/12243806/chalk-talk-sip-uri-dialing-and-ils-networking

[csco11063007]

Dear Dennis,

Thanks for your quick response and suggestion. I am still confused.

Consider I have expressway-edge-site1 & expressway-edge-site2 are located in Site 1 & Site2 respectively. So I need to use two public IP, one at each site. I have to create the srv record collab-edge with mapping to two public IPs and available in the external dns at both sites.

Consider I have user1@mydomain.com is located in Site1 & user2@mydomain.com is located in Site 2. So basically collab-edge srv will resolve this address can be either of the Expressway.

So for example - when user1 is Site 1 try to log-in , there is always a chance that srv record might resolve to Site 2 expressway public IP  instead of Site 1 expressway IP.

Is there any mechanism  that user1 will always resolves to Site 1 expressway public IP ?

Thanks

Thomas