UDS is enabled by default on all your CUCM servers by the way. In most cases Jabber uses a SRV records to locate a CUCM server running the User Data Service (UDS). The underlying PC takes care of addressing and Jabber has to find alternative methods to get to its TFTP server to download its configuration file. Jabber on the other hand works a little differently as it does not use DHCP directly. The phone looks up a TFTP server address based on DHCP option 150 and downloads its configuration and files from the published address. CUCM TFTP server selection for Cisco phones has been a well known architecture for quite some time.
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