ACA Troubleshooting & Diagnostics 2 — Questions and Answers
Question 1: AudioCodes 'Syslog' messages are categorized by severity. Which severity level indicates a critical failure requiring immediate attention?
- Emergency (0) or Critical (2) (Correct answer)
- Warning (4)
- Informational (6)
- Debug (7)
Correct answer: Emergency (0) or Critical (2)
Syslog severity levels 0 (Emergency) and 2 (Critical) represent the most severe conditions — system failures or imminent failures that require immediate operator action.
Question 2: When a fax call fails through an AudioCodes gateway configured for T.38, the first parameter to verify is:
- That T.38 is enabled on both the originating and terminating gateways/devices (Correct answer)
- The voice codec negotiated in the initial SDP
- The SIP registration status of the fax endpoint
- The DTMF relay method configured on the gateway
Correct answer: That T.38 is enabled on both the originating and terminating gateways/devices
T.38 fax relay requires that both endpoints support and negotiate T.38 in their SDP; if either side does not enable T.38, fax calls will fail or degrade.
Question 3: What does the AudioCodes SNMP trap 'acAlarmsActiveAlarmTableEntry' indicate when received by a monitoring system?
- A new active alarm has been raised on the device requiring operator review (Correct answer)
- A call quality threshold has been crossed
- A firmware upgrade has completed successfully
- A SIP registration has expired
Correct answer: A new active alarm has been raised on the device requiring operator review
The acAlarmsActiveAlarmTableEntry SNMP trap notifies the management system that a new alarm entry has been added to the active alarm table, requiring attention.
Question 4: During AudioCodes troubleshooting, a 'Media Timeout' disconnect cause indicates:
- No RTP packets were received within the configured silence timeout period, causing the call to be released (Correct answer)
- The SIP session timer expired without a re-INVITE
- The PSTN trunk sent a disconnect frame
- The TLS session expired mid-call
Correct answer: No RTP packets were received within the configured silence timeout period, causing the call to be released
A media timeout occurs when the device stops receiving RTP packets for longer than the configured period (e.g., due to a routing failure), automatically releasing the call.
Question 5: Which AudioCodes command-line utility can be used to test IP connectivity from the device to a remote SIP server?
- ping (via CLI 'ping' command) (Correct answer)
- traceroute sip
- sip-test utility
- nslookup sip
Correct answer: ping (via CLI 'ping' command)
AudioCodes Mediant CLI supports the standard 'ping' command to test basic ICMP reachability from the device's IP interface to a remote address.
Question 6: When AudioCodes reports a 'No Coder' disconnect reason, it means:
- SDP negotiation failed because no common codec was found between the two call legs (Correct answer)
- The DSP module is physically absent
- The coder group is empty in configuration
- DTMF out-of-band negotiation failed
Correct answer: SDP negotiation failed because no common codec was found between the two call legs
'No Coder' indicates the device could not find a mutually supported codec between the incoming and outgoing SDP offers, causing the call to be rejected during setup.
ACA Troubleshooting & Diagnostics 2
AudioCodes 'Syslog' messages are categorized by severity.
Which severity level indicates a critical failure requiring immediate attention?