Cisco SIP phone 7821 not register to Cisco ISR4321

Cisco Network Interface Modules - blank faceplate for nim slot on cisco isr 4400 Adapter for the NIM in a SM-X slot on the Cisco 4400 or 4300 series ISR Step 2 Remove the blank faceplate installed over the SM slot of the blank slot machine png Cisco Blank Faceplate for NIM Slot on Cisco ISR4400

blank faceplate for nim slot on cisco isr 4400 CISCO 1340 - Blank faceplate for NIM slot on Cisco ISR 4400 · High quality for less · Refurbished