You don't need to add any licenses but you do need the proper files;
Phone Firmware Files
For Java-based IP phones, such as the Cisco Unified IP Phone 7911, 7941, 7941GE, 7961, 796GE, 7970, and 7971, the firmware consists of multiple files including JAR and tone files. All of the firmware files for each phone type must be downloaded the TFTP server before they can be downloaded to the phone.
The following example shows a list of phone firmware files that are installed in flash memory for the Cisco Unified IP Phone 7911:
However, you only specify the filename for the image file when configuring Cisco Unified CME. For Java-based IP phones, the following naming conventions are used for image files:
SCCP firmware - TERMnn.xx-y-z-ww or SCCPnn.xx-y-zz-ww, where n represents the phone type, x represents the major version, y represents the major subversion, z represents the maintenance version, and w represents the maintenance subversion.
The following example shows how to configure Cisco Unified CME so that the Cisco Unified IP Phone 7911 can download the appropriate SCCP firmware from flash memory:
SCCP: Upgrading or Downgrading Phone Firmware Between Versions
To downgrade or upgrade firmware versions on a Cisco Unified IP phone running SCCP, perform the following steps.
Phone firmware for Cisco Unified IP phones to be connected to Cisco Unified CME, including all versions required during an upgrade or downgrade sequence, must be loaded in the flash memory of the TFTP server from which the phones download their configuration profiles.
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