Which two errors cause a Cisco phone to reset? (Choose two.)

Changing a MAC address in CUCM requires an administrator to manually apply the change, but the phone itself does not autonomously detect a CUCM database MAC change and initiate a reset without receiving a direct signal.

CUCM sends periodic station keepalive and timing messages to registered SCCP phones; if a phone does not receive these timing signals within the expected interval, it determines the connection is lost and performs a reset to re-register.

An incorrectly configured IP address would prevent initial registration but would not cause a phone that is already registered and operational to reset.

SCCP requires a bidirectional keepalive exchange between the phone and CUCM; if the phone does not receive proper keepalive acknowledgements from CUCM within the configured timeout, it resets and attempts re-registration with an available CUCM subscriber.

A TCP connection failure causes the SCCP session to drop and triggers re-registration, but this is a connection recovery event rather than a phone reset caused by a specific CUCM-originated error condition.