Is it possible to configure stutter tone on Unity Connection version 7.x ? I can't find any documentation on this feature..
Actually, the audible message waiting indication (ie. "stutter" dial-tone) is a function of the CUCM. You can modify it on the Device level as shown here:
In the above example, "stutter mwi" is enabled. This can also be modified under the service parameters for the Cisco CallManager service.