Hi Arthur,
You just need to upgrade the firmware on the 7914. Have a look at the following;
Cisco Unified IP Phone Expansion Module 7914
If you are using the Cisco Unified IP Phone Expansion Module 7914, you must upgrade the expansion module to firmware release S00105000200 before using the phone to support relevant 8.0(4) SR1 features on your expansion module.
You can download the installation program, which is named cmterm-7914-sccp.5-0-2.exe, and the readme file from Cisco.com at this location:
http://www.cisco.com/pcgi-bin/tablebuild.pl/ip-7900ser
From this doc;
http://www.cisco.com/en/US/products/hw/phones/ps379/prod_release_note09186a00807219b5.html#wp68082
Hope this helps!
Rob
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