• Power over Ethernet (PoE) doesn't meet the required power-supply.
• Connected number of key expansion modules exceed maximum "Number of Units".
Solution
• Change the phone to use the same type of expansion module.
• Check the PoE the phone connected to.
• Check if the unit number is bigger than the “Number of Units".
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
121
Hardware and Accessory Installation
Key Expansion Module Does Not Go Through the Normal Start Up Process
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