IP Phones

IP Phones

Use CDP to discover Voice VLAN
Use DHCP to get IP configuration and TFTP server.
Phones are identified by MAC address

TFTP Device Configuration File

IP phones download their specific configuration file (XML) from the TFTP server.
SEPMACADDRESS.cnf.xml
If not found, XMLDefault.cnf.xml used to stage phones.
Configuration file points to CUCM or CUCME

SCCP Phone Boot Process

  1. IP phone gains power from PoE switch
  1. Phone loads local image
  1. Uses CDP to learn Voice VLAN from the switch
  1. DHCP request
  1. Uses TFTP to download config
  1. IP Phone registers with CUCM | CUCME

Auto Registration

  1. Phone attempt normal boot process
  1. Phone downloads XMLDefault.cnf.xml
  1. Updates firmware if required
  1. CUCM creates device-specific XML
  1. phone reboots and used device-specific file to complete registration

SIP Phone Registration

  1. Phone requests CTL file if present
  1. Phone requests SEPMACADDRESS.cnf.xml if present else XMLDefault.cnf.xml
  1. SIP phone requests load files
  1. Downloads local dial plan if configured