CUCM Phone Configuration: Cisco IP Phone Boot Process

1. Switch detects unpowered device, supplies power

2. Phone boots software image

3. Switch provides voice VLAN information to the IP Phone via CDP

4. Phone sends DHCP request, receives IP and TFTP information

5. Phone contacts TFTP server, retrieves configuration file

6. Phone contacts first CCM server listed in config file

  • Restart = Update a change to the phone
  • Reboot = Pull power of phone/change IP etc…