There is a registry setting that you can specify.
HKEY_CURRENT_USER\Software\Cisco Systems, Inc.\Client Services Framework\AdminData\
You will also need to make changes to the CUPS config for the TFTP, CTI gateway and CCMCIP settings.
Application -> Cisco Jabber/CUPC -> Setttings.
You'll also need to change the truck settings to CUCM if you have this configured.
Not 100% sure on Jabber. Maybe someone else can comment on that.