How do Cisco Unified Communications IP phones receive firmware upgrades?（）A、user request using the keypad of the phone and HTTP downloadB、IT department scheduled upgrade using HTTP downloadC、TFTP download based on version control through Cisco Unified Communications ManagerD、FTP download based on version control through Cisco Unified Communications ManagerE、HTTP download based on version control through Cisco Unified Communications Manager
How do Cisco Unified Communications IP phones receive firmware upgrades?（）
- A、user request using the keypad of the phone and HTTP download
- B、IT department scheduled upgrade using HTTP download
- C、TFTP download based on version control through Cisco Unified Communications Manager
- D、FTP download based on version control through Cisco Unified Communications Manager
- E、HTTP download based on version control through Cisco Unified Communications Manager
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