I have often been asked for a quick way to convert a Cisco IP-Phone between SIP and SCCP. People get their IP-Phones often from E-Bay or other 2nd hand resource for testing and practicing and they may receive them with the ”other” phone load they didn’t want. The easiest way to convert is via Autoregistration. With CME this is a litle more complex, but with UCM (v6 or higher) this is an easy task.
First of all, switch on Autoregistration. If you need help with that, there is another post by Brandon in this blog how to switch on Autoregistration.
Second, switch the Autoregistration Protocol to SIP or SCCP in the Enterprise Parameters (System -> Enterprise Parameters) . If the phone had been registered before, it needs to be deleted, otherwise it will not be considered as a “new” one and Communicationmanager will just reregister the phone.
Save the new setting and delete the phone and connect it if not yet done. The phone now will download the default configuration file and the new phone loads. It will reload multiple times, so just be a little patient.
One remark for phones being connected to the UCM behind a WAN: TFTP-downloads via a WAN can be pretty slow. A download can be between 20 and 30 minutes for all phones based on Java which are literally all but the older 7940′s and 7960′s
by Patrick Geschwindner, Ascolta
