Difference between Call Manager Express and Unified Call Manager

In Cisco Terminology there are Call Manager Express and Unified Call Manager
I would like to know the difference.
which of them I can copy to flash then will enable me to configure IP Phones?
I believe CME is the one I saw Cisco Admins copy to the router Flash and configure IP phones at the router command line, I am not sure about UCM, if it is the same.

I also would like to know which GUI software is used in CISCO to manage IP Phones.

Any Help will be very much appreciated.

Thank you
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José MéndezCommented:
Communications Manager
- Runs on UCS servers virtualized on VMware
- GUI Based
- No access to underlying Redhat OS

Communications Manager Express
- Runs as a feature set of IOS
- Limited Features vs full CM above
- Has a GUI as well if you enable it, most of the config though is done through CLI

You manage IP Phones from these 2 GUIs that I mentioned depending on which version you have.

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jskfanAuthor Commented:
Thank You
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