Which component provides a list of Cisco Unified Communications Manager node addresses that allow the phone to register to the cluster?

Which component provides a list of Cisco Unified Communications Manager node addresses that allow the phone to register to the cluster?
A. DNS option 150
B. DHCP option 150
C. DHCP option 66
D. configuration file from TFTP server
E. Primary Cisco Unified Communications Manager node from configuration file additional nodes during registration.

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8 thoughts on “Which component provides a list of Cisco Unified Communications Manager node addresses that allow the phone to register to the cluster?

  1. I agree with Amit, the answer is option 150. Unless it is preconfigured, the phone will not be able to find and register to the servers to be able to download it’s configuration and CM Group via TFTP.

  2. answer is D
    Unified Communications Manager only: A configuration file includes a list of Unified Communications Manager’s to which devices (telephones and gateways) make connections. When a device boots, the component queries a Dynamic Host Configuration Protocol (DHCP) server for its network configuration information. The DHCP server responds with an IP address for the device, a subnet mask, a default gateway, a Domain Name System (DNS) server address, and a TFTP server name or address. The device requests a configuration file from the TFTP server. The configuration file contains a list of Unified Communications Manager’s and the TCP port through which the device connects to those Unified Communications Manager’s. The configuration file contains a list of Unified Communications Managers and the TCP port through which the device connects to those Unified Communications Manager’s.

  3. Initial thought is DHCP Option 150, however, DHCP option 150 is only providing the TFTP server address(es), not the registration server address. A TFTP server does not have to have Call Manager services running on it, in fact they can be disabled and the servers only job can be as a TFTP server handing out configuration files that provide the registration server list.

  4. I also believe it is D.

    https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/8_5_1/ccmsys/accm-851-cm/a02tftp.html

    A configuration file contains a prioritized list of Cisco Unified Communications Managers for a device (phones that are running SCCP and phones that are running SIP and gateways), the TCP ports on which the device connects to those Cisco Unified Communications Managers, and an executable load identifier. Configuration files for selected devices contain locale information and URLs for the phone buttons: messages, directories, services, and information. Configuration files for gateways contain all their configuration information.

  5. Using Cisco IP Phones with a DHCP Server

    Enterprises with small branch offices that implement a Cisco IP Telephony Voice over IP solution typically implement Cisco CallManager at a central office to control Cisco IP Phones at small branch offices. This implementation allows centralized call processing, reduces the equipment required, and eliminates the administration of additional Cisco CallManager and other servers at branch offices.

    Cisco IP Phones download their configuration from a TFTP server. When a Cisco IP Phone starts, if it does not have both the IP address and TFTP server IP address preconfigured, it sends a request with option 150 or 66 to the DHCP server to obtain this information.

    •DHCP option 150 provides the IP addresses of a list of TFTP servers.

    •DHCP option 66 gives the IP address or the hostname of a single TFTP server.

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