Cisco 7800 Series

Possible Explanation and ActionDescriptionMessage
Network is busy: The errors should resolve
themselves when the network load reduces.
No network connectivity between the IPv4 DHCP
server and the phone: Verify the network
connections.
IPv4 DHCP server is down: Check configuration
of IPv4 DHCP server.
Errors persist: Consider assigning a static IPv4
address.
IPv4 DHCP server did not respond.IPv4 DHCP Timeout
Network is busy - The errors should resolve
themselves when the network load reduces.
No network connectivity between the IPv6 DHCP
server and the phone: Verify the network
connections.
IPv6 DHCP server is down: Check configuration
of IPv6 DHCP server.
Errors persist: Consider assigning a static IPv6
address.
IPv6 DHCP server did not respond.IPv6 DHCP Timeout
Network is busy: The errors should resolve
themselves when the network load reduces.
No network connectivity between the IPv4 DNS
server and the phone: Verify the network
connections.
IPv4 DNS server is down: Check configuration
of the IPv4 DNS server.
IPv4 DNS server did not respond.IPv4 DNS Timeout
Network is busy: The errors should resolve
themselves when the network load reduces.
No network connectivity between the IPv6 DNS
server and the phone: Verify the network
connections.
IPv6 DNS server is down: Check configuration
of the IPv6 DNS server.
IPv6 DNS server did not respond.IPv6 DNS Timeout
Verify that the host names of the TFTP server or
Cisco Unified Communications Manager are
configured properly in IPv4 DNS.
Consider using IPv4 addresses rather than host
names
IPv4 DNS could not resolve the name of
the TFTP server or Cisco Unified
Communications Manager.
DNS unknown IPv4 Host
Cisco IP Phone 7800 Series Administration Guide for Cisco Unified Communications Manager
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Cisco IP Phone Status