Got the same issue with a 7921 (CUCM 4.3). No matter the phone, I can't transfer using AbbrDial.The only workaround I found is to use de Personal Fast Dial service.Reference:http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/3_1_1/ccmcfg/b09pd....

Just guessing if you're deployment is Corporate Directory-integrated (AD/Lotus) and the jtapi_user's description is "CiscoPrivateUser" to hide it from Corp Dir listing. IPCC needs it to be visible to update it.If hiding it is a requirement you can ma...