The Cisco Unified IP Phones 7906G, 7911G, 7941G, 7941G-GE, 7942G, and 7945G, do not support the Cisco Unified IP Phone Expansion Module 7914.
You can add a maximum of two Expansion Modules to the Cisco Unified IP Phones 7961G, 7961G-GE, 7965G, 7970G, 7971G, and 7975G.
The filename for Cisco Unified IP Phone Expansion Module 7914 indicates that it is for use with SCCP; however, it supports both SCCP and SIP. This applies to IP Phones using Cisco Unified
Communications Manager 7.0.
If you are using the Cisco Unified IP Phone Expansion Module 7914, you must upgrade the expansion module to firmware release S00105000400 before using the phone to support relevant features on your expansion module.