I'm so bored today... that I started moving my first steps into the magic wonders of IP Telephony! :-)
The only tool I have at the moment is the great Packet Tracer, as I'm a Networking Academy instructor and Alumni.
Well, I have to admit that I'm completely a newbie on IP Telephony, so like every CCNA, I started using Packet Tracer to simulate a simple multisite CME installation.
Here is the result:
You can download the Packet Tracer topology file Here, the topology is already configured and ready to play with.
The relevant topics I have learned with this small lab are:
-the use of option 150 in DHCP for IP Phones
-the basic dial peer configuration for multisite CME
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