ACA High Availability & Redundancy 2

Question 1

What does 'Hitless Switchover' mean in the context of AudioCodes HA?

Accepted Answer

Active calls are preserved and continue without interruption after failover to the standby unit

Answer

The switchover occurs so quickly that SIP registration timers do not expire

Answer

The standby unit takes over without requiring a physical network cable change

Answer

Configuration is applied to the standby unit without interrupting the active unit's traffic

Question 2

What mechanism does the AudioCodes standby unit use to detect that the active unit has failed?

Accepted Answer

Keep-alive messages exchanged over the dedicated HA link

Answer

Periodic ICMP ping to the active unit's management IP

Answer

SIP OPTIONS polling sent every 30 seconds

Answer

SNMP heartbeat traps sent to a centralized NMS

Question 3

In AudioCodes HA, what is a 'Manual Switchover' used for?

Accepted Answer

Forcing a failover during planned maintenance without waiting for a failure event

Answer

Resetting the standby unit to factory defaults before re-pairing

Answer

Migrating the HA pair to a new subnet without service interruption

Answer

Upgrading firmware on the active unit while keeping the standby on the old version

Question 4

What is the recommended approach for upgrading firmware on an AudioCodes HA pair to minimize downtime?

Accepted Answer

Upgrade the standby unit first, perform a manual switchover, then upgrade the originally-active unit

Answer

Upgrade both units simultaneously to avoid version mismatches

Answer

Disable HA, upgrade both units independently, then re-enable HA

Answer

Upload new firmware to the EMS and let it push to both units automatically at 2 AM

Question 5

Which AudioCodes HA state indicates the unit is fully synchronized and prepared to assume the active role?

Accepted Answer

Hot Standby

Answer

Initializing

Answer

Warm Standby

Answer

Passive Monitor

Question 6

What happens to SIP registrations on endpoints when an AudioCodes HA failover occurs with hitless switchover enabled?

Accepted Answer

Registrations are preserved because the standby takes the virtual IP and retains the registration database

Answer

All SIP endpoints must re-register because the standby unit uses a different IP address

Answer

Endpoints receive a SIP 503 Service Unavailable and automatically retry after 30 seconds

Answer

Only endpoints registered within the last 60 seconds are preserved; older registrations expire

Question 7

In an AudioCodes HA pair, which unit is responsible for sending SNMP traps and syslog messages to the NMS during normal operation?

Accepted Answer

Only the active unit sends traps and logs; the standby suppresses these events

Answer

Both units send identical traps and logs simultaneously for redundancy

Answer

The standby unit handles all management plane traffic while the active handles media

Answer

The EMS server polls both units and aggregates the results into a single stream