Hi Ali,
Support for IP Communicator was added in CME 4.0 Have a look at the steps below;
SCCP: Configuring Cisco IP Communicator Support
To enable support for Cisco IP Communicator, perform the following steps.
Prerequisites
Cisco Unified CME 4.0 or a later version
Cisco IP Communicator 2.0 or a later version
IP address of the Cisco Unified CME TFTP server
(Optional) Headsets with microphones for users
DETAILED STEPS
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Step 1 Download the latest version of the Cisco IP Communicator software and install it on your PC.
The download website is at http://www.cisco.com/pcgi-bin/tablebuild.pl/ip-iostsp.
Step 2 (Optional) Attach a headset with microphone to your PC.
Step 3 Start the Cisco IP Communicator application.
Step 4 Define the IP address of the Cisco Unified CME TFTP server.
a. Open the Network > User Preferences window.
b. Enter the IP address of the Cisco Unified CME TFTP server.
Step 5 Wait for the Cisco IP Communicator application to connect to Cisco Unified CME and register.
Step 6 Configure the extension numbers and line buttons for the Cisco IP Communicator.
Use the normal phone provisioning commands described in the "SCCP: Creating Directory Numbers" section. In the type command, use the CIPC keyword to identify this phone as a Cisco IP Communicator.
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SCCP: Verifying Cisco IP Communicator Support
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Step 1 Use the show running-config command to display ephone-dn and ephone information associated with this phone.
Step 2 After Cisco IP Communicator registers with Cisco Unified CME, it displays the phone extensions and soft keys in its configuration. Verify that these are correct.
Step 3 Make a local call from the phone and have someone call you. Verify that you have a two-way voice path.
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SCCP: Troubleshooting Cisco IP Communicator Support
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Step 1 Use the debug ephone detail command to diagnose problems with calls. For more information, see the Cisco Unified CME Command Reference.
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From this good doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps4625/products_configuration_guide_chapter09186a00807e13a7.html#wp1046762
Hope this helps!
Rob
