Represents a SIP Call-ID value where a randomly generated alphanumeric token is followed by an at-sign and a direct IPv4 address. This format is commonly observed in automated SIP scanners, VoIP enumeration tools, and bot-driven INVITE floods that construct synthetic Call-ID headers referencing the target host IP (often the sensor or destination endpoint) rather than a legitimate domain-based identifier used by standard SIP clients or PBX systems.