A new Cisco 7965 IP phone is installed on a Cisco Unified Communications Manager Express
system. When the phone requests the .loads file from the TFTP server, it sees that the versions
are different. What does the IP phone do to resolve this issue?
A.
The IP phone requests the SEP<mac>.cfg file and reboots.
B.
The IP phone attempts to obtain the new firmware file image from the TFTP server.
C.
The IP phone boot requests the XMLDefault.cnf.xml file and boots up.
D.
The IP phone does not boot up and will require manual intervention to factory reset the phone
before a new firmware image can be downloaded.
Explanation:
Cisco IP Phone Initialization Process:
1. At initialization, the Cisco IP phone sends a request to the DHCP server to get an IP address,
DNS server address, and TFTP server name or address, if appropriate. Options are set in DHCP
server (Option 066, Option 150, and so on). It also gets a default gateway address if set in DHCPserver (Option 003).
2. If a DNS name of the TFTP sever is sent by DHCP, then a DNS sever IP address is required to
map the name to an IP address. This step is bypassed if the DHCP server sends the IP address of
the TFTP server. In this case study, the DHCP server sent the IP address of TFTP because DNS
was not configured.
3. If a TFTP server name is not included in the DHCP reply, then the Cisco IP phone uses the
default server name.
4. The configuration file (.cnf) file is retrieved from the TFTP server. All .cnf files have the name
SEP<mac_address>.cnf, where “SEP” is an acronym for Selsius Ethernet Phone. If this is the first
time the phone is registering with the Cisco CallManager, then a default file, SEPdefault.cnf, is
downloaded to the Cisco IP phone.
5. All .cnf files include the IP address(es) of the primary and secondary Cisco CallManager(s). The
Cisco IP phone uses the IP address to contact the primary Cisco CallManager and register.
6.Once the Cisco IP phone has connected and registered with Cisco CallManager, the Cisco
CallManager tells the Cisco IP phone which executable version (called a load ID) to run. If the
specified version does not match the executing version on the Cisco IP phone, the Cisco IP phone
will request the new executable from the TFTP server and reset automatically.
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