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172.110.223.157 has a threat confidence score of 92%. This IP address from Hong Kong (AS23470, ReliableSite.Net LLC) has been observed in 55 honeypot sessions targeting SIP protocols. First observed on April 30, 2026, most recently active April 30, 2026.
Represents an unsolicited SIP INVITE request targeting a long numeric destination, with the request accepted for processing by the SIP server (100 Trying). While the Call-ID format appears consistent with legitimate SIP implementations, the absence of prior registration and the use of a PSTN-style numeric target indicate probing of call routing or gateway behavior rather than normal call setup. This behavior is commonly observed during early-stage toll-fraud reconnaissance or PBX routing validation.