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Troubleshooting & Diagnostics Flashcards

6 cards from real ACA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. When an AudioCodes Mediant gateway returns SIP response '503 Service Unavailable' to outbound calls, the most likely cause is:

    Answer: The configured SIP proxy is unreachable or all proxy servers in the proxy set are down

    A 503 response typically indicates the gateway cannot reach any of the configured SIP proxies, either because they are down or because network connectivity to them is lost.

  2. Which AudioCodes tool provides real-time SIP message tracing directly from the web GUI without needing an external packet capture?

    Answer: SIP Ladder Diagram (Message Log / Syslog viewer)

    The AudioCodes web GUI's Message Log displays a real-time SIP ladder diagram showing INVITE, 100 Trying, 180 Ringing, and other messages with timestamps for quick troubleshooting.

  3. A one-way audio issue on calls through an AudioCodes gateway is most commonly caused by:

    Answer: NAT traversal problems preventing RTP from reaching one endpoint

    One-way audio typically occurs when RTP can flow in one direction but NAT or firewall blocks prevent the return path, causing only one side to hear audio.

  4. Which AudioCodes CLI command shows active calls and their current state in real time?

    Answer: show voip calls active

    The 'show voip calls active' command displays all currently active call legs with their SIP state, codec, and media information on AudioCodes Mediant devices.

  5. When troubleshooting AudioCodes OVOC connectivity to a managed device, which port must be open from the device to the OVOC server?

    Answer: UDP 161 (SNMP) and TCP 443 (HTTPS)

    OVOC uses SNMP (UDP 161) for monitoring/traps and HTTPS (TCP 443) for configuration push and device communication, so both ports must be allowed through firewalls.

  6. What does a SIP '488 Not Acceptable Here' response indicate during call troubleshooting?

    Answer: The called party does not support any of the codecs offered in the SDP

    A 488 response means the remote end rejected the SDP offer because none of the proposed codecs, media types, or parameters are acceptable, indicating a codec mismatch.