Intrusion Prevention

VoIP.SIP.Code.100.Without.Text.Description

Description

This indicates detection of a SIP status message with code 100 (Trying) but no text description. This is legal but unexpected and may confuse or crash a SIP implementation.

Affected Products

N/A

Impact

Denial of Service: Remote attackers can crash vulnerable systems.

Recommended Actions

This may indicate an attempted probe or attack.