What does it take to get my Cisco 7960, 7940, or 7910 IP Phone to register with Cisco CallManager?
A. The registration of a Cisco IP Phone with Cisco CallManager is a four-step process. • The phone requests an IP address from the DHCP service. • The DHCP response returns the address of the TFTP server in one of these forms: • Static IP address • Option 150 (single IP address) • Option 66 (first IP address or Domain Name System [DNS] name) • Lookup CiscoCM1.your.domain • Once the phone has the TFTP address, the phone requests its configuration information from the TFTP server. In Cisco CallManager 3.0, this configuration information is in the form of a .cnf file. In release 3.1, the configuration file is an .xml file. The configuration information contains a prioritized list of up to three Cisco CallManager servers, the device pool to which the phone belongs, and information about the phone load version if the release is 3.1. • The phone establishes communication with the Cisco CallManager that is highest in the prioritized list and sends a registration request. If the phone requests
