Multiple Unity Connection Clusters may be networked together to provide cross-server features such as sign-in, transfer and live reply. An example would be a dial by name in a company directory being able to search multiple clusters and route the call appropriately.

First thing you’ll need is to define a route pattern in CUCM that will point to each Unity cluster. The CSS of each Unity Connection cluster should have access to this route pattern. In the following example I will use: ##991 to Site A and ##992 to Site B.

Next, add a HTTP(S) link under Networking, Branch Management. This adds the site under Networking, Locations. Notice you’ll only need to do this on one cluster- it will automatically add it to the neighbor cluster.

Now you’ll add the route pattern you created in step one to each cluster’s respective locations and check both “Allow Cross-Server..” options. This is the target dial string, so the route pattern going to site B will go on site A’s cluster.

Under Advanced, Conversations you’ll need to check “Respond to Cross-Server Handoff Requests”

OK at this point you can check under Users and you should see users from both clusters to tell you HTTP(s) networking is working, but before we can make the features work, take the steps below to create some partitioning:

  1. Create a “hidden” and an “intersite” partition on both clusters.
  2. Create a site-specific “reply-all” search space including each sites default partition (it’s own first, then its neighbors) and the intersite partition.
  3. Create a shared “master distribution list” search space, including all partitions, starting with site specific partitions, then the intersite partition, then the hidden.
  4. Rename the system distribution list on each cluster and change it to use the hidden partition.
  5. Create a new “master distribution list” to use the master distribution list partition.
  6. Change the system directory handler to use the new master distribution list search space

Now we just need to configure the clusters to respond to cross cluster requests. This uses a series of dtmf codes to hand the call off between servers. You’ll need to run the following via CLI to enable this:

run cuc dbquery unitydirdb execute procedure csp_ConfigurationCreate
(pName=’HandoffForwardRemoteForward’::lvarchar, pParentFullName=’System.Conversations.CrossBox’::lvarchar, pType=11, pValueBool=1, pRequiresRestart=1)

run cuc dbquery unitydirdb execute procedure csp_ConfigurationModify (pName=’HandoffForwardRemoteForward’::lvarchar, pParentFullName=’System.Conversations.CrossBox’::lvarchar, pValueBool=1)

Almost done – the only thing left is a call handler to answer the call.

  1. Copy the opening greeting to create a “CrossCluster_CallHandler.
    1. Under caller input, uncheck “ignore further input” under #.
  2. Create a Direct Routing Rule.
    1. Condition “Dialed Number Equals ##992” (this is what it answers to)
    2. “Send Call to” should go to the “CrossCluster_CallHandler”

See the official documentation here

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