Cisco SIP phone 7821 not register to Cisco ISR4321

Cisco Network Interface Modules - blank faceplate for nim slot on cisco isr 4400 Back panel slots and ports of the Cisco 4451-X ISR 1 Router fan 10 NIM slot 2 11 NIM slot 3 12 blank slot machine png Align the NIM-SSD carrier card to the router base Step 2 Use both hands to slide it back into the slot in the Cisco 4451-X ISR Step

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