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172.110.223.5 has a very high threat confidence level of 98%, originating from Hong Kong, on the ReliableSite.Net LLC network (23470). It has been observed across 20,610 sessions targeting SIP, First observed on January 30, 2026, most recently active February 13, 2026.
Represents an automated SIP INVITE request likely generated by a scanner or bot rather than a legitimate user agent. The behavior is inferred from a combination of a numeric-only SIP Call-ID format and a direct INVITE to a long numeric target without prior registration or dialog context. This pattern is commonly associated with SIP service probing, extension discovery, or early-stage toll-fraud reconnaissance. This behavior indicates reconnaissance activity against a SIP service but does not, by itself, confirm successful call setup or financial abuse.