Hi Mikheil,
You can add new Subscriber servers (nodes) without reinstalling the 1st Publisher server;
Configuring a Subsequent Node
To configure a subsequent node in the cluster, follow these steps.
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Caution You must configure a subsequent node on the first node by using Cisco Unified CallManager Administration before you install the subsequent node. For more information, see the Cisco Unified CallManager Administration Guide.
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Procedure
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Step 1 On the First Node Configuration window, read the Warning and make sure you have correctly configured the first node. To continue with the installation of the subsequent node, click OK.
The Network Connectivity Test Configuration window displays.
Step 2 During installation of a subsequent node, the system checks to ensure that the subsequent node can connect to the first node.
•To pause the installation after the system successfully verifies network connectivity, choose Yes.
•To continue the installation with a pause, choose No.
The First Node Access Configuration window displays.
Step 3 Enter the first node connectivity information from Table 10 and choose OK.
The system checks for network connectivity.
If you chose to pause the system after the system successfully verifies network connectivity, the Successful Connection to First Node window displays. Choose Continue.
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Note If the network connectivity test fails, the system always stops and allows you to go back and reenter the parameter information.
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The SMTP Host Configuration window displays.
Step 4 If you want to configure an SMTP server, choose Yes and enter the SMTP server name.
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Note To use certain operating system features, you must configure an SMTP server; however, you can also configure an SMTP server later by using the operating system GUI or the command line interface.
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The Platform Configuration Confirmation window displays.
Step 5 To start installing the software, choose OK, or, if you want to change the configuration, choose Back.
Step 6 When the installation process completes, you get prompted to log in by using the Administrator account and password.
Step 7 Complete the post-upgrade tasks
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/install/5_1/cmins513.html#wp91911
Hope this helps!
Rob
