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51.91.168.102 has a very high threat confidence level of 99%, originating from France, on the OVH SAS network (16276). It has been observed across 293,274 sessions targeting SIP, First observed on February 5, 2026, most recently active March 3, 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.