Hi Manfred, you can change ringtones on your Cisco IP phone using our Phone Designer product. This allows you to change wallpaper and ringtones on your phone. See this page for more details: http://cisco.com/en/US/products/ps9829/index.html
You can't do this from CUCIMOC, but the Phone Designer product is one of our Cisco UC products in our overall UC solution.
Product Manager, Cisco Unified Communications
I want to change the ringtone for the CUCIMOC, not with the CUCIMOC.In other words, how can I change the wav file (or other sound file) for the ringtone in CUCIMOC as a Softphone.
While it is probably not officially supported, and is not the ideal way, I changed my ring tone for CUPC by finding the .wav file and replacing it with a different file.