ACA Troubleshooting & Diagnostics

Question 1

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

Accepted Answer

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

Answer

An incorrect codec configuration

Answer

A DTMF relay mismatch

Answer

An expired TLS certificate on the local device

Question 2

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

Accepted Answer

SIP Ladder Diagram (Message Log / Syslog viewer)

Answer

Wireshark plugin

Answer

SNMP MIB browser

Answer

CDR report generator

Question 3

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

Accepted Answer

NAT traversal problems preventing RTP from reaching one endpoint

Answer

A SIP 488 codec mismatch

Answer

An incorrect DTMF mode

Answer

A TLS handshake failure

Question 4

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

Accepted Answer

show voip calls active

Answer

debug sip call

Answer

list sessions current

Answer

show rtp streams

Question 5

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

Accepted Answer

UDP 161 (SNMP) and TCP 443 (HTTPS)

Answer

TCP 5060 (SIP) only

Answer

UDP 5004 (RTP) only

Answer

TCP 8080 (HTTP proxy)

Question 6

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

Accepted Answer

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

Answer

The SIP proxy requires authentication

Answer

The destination is busy

Answer

The SIP URI was not found in the dial plan