So I actually just solved this issue on Friday! Apparently these phones are known to get a little confused so you do a factory reset and put all of your settings back into the vetch web management page but set the registration expiration to 60 seconds instead of the standard 3600 secs. Cisco is looking for the Keep alive registration message every 60 secs so if Vtech isn't sending it until 3600 Cisco drops it as rogue and never looks back! Give this a shot, hope it works for you as well!! Thanks for your response! Ryan DISCLAIMER: The information contained in this electronic message is legally privileged and confidential under applicable law and is intended for a particular addressee(s). If it is not clear that you are the intended recipient, you are hereby notified that you have received this transmittal in error; any review, copying or distribution or dissemination is strictly prohibited. If you suspect that you have received this transmittal in error, please notify Southwestern VT Health Care Corporation immediately by return email reply to helpdesk@phin.org, and immediately delete the transmittal and any attachments without making any copy or distribution. Thank you. ... View more

Were you ever able to resolve this issue? I am trying to introduce the VCS 754 to the CUCM environment and I am not having much luck!!! All of the settings are in place... The user has been built with DN for username and password A device was built and associated to the user and all of the correct calling search spaces have been applied... The phone registers and will make a call and receive a call but will unregister every 2 mins... I go to web services page for the device and change any setting and hit save changes and the phone will re register for another 2 minutes!!!     Any thoughts at all would be helpful!!!       Thanks!!   ... View more