Hi,
You need to make sure that your IOS is the correct version for the CME version you pick
Have a look at the CME software matix
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/requirements/guide/33matrix.html
and the CME admin guide
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/admin/configuration/guide/cmeadm/cmeroad.html
Regards
Alex
Regards,
Alex.
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