Cisco ASA Audit Event: 202016

202016: Unable to allocate SIP secondary channel for message

Cisco ASA is a security device that provides the combined capabilities of a firewall,an antivirus,and an intrusion prevention system. It also facilitates virtual private network (VPN) connections. It helps to detect threats and stop attacks before they spread through the network.

Message: %ASA-3-202016: "%d: Unable to pre-allocate SIP %s secondary channel for message" \ "from %s:%A/%d to %s:%A/%d with PAT and missing port information.\n"

When an SIP application generates an SDP payload with media port set to 0, a PAT xlate for such invalid port request cannot be allocated. The packet would get dropped with this syslog. That is when event 202016 gets generated.

How could you resolve this situation?

This event is an application-specific event and does not require any action.

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