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157.245.5.3 has a threat confidence score of 69%. This IP address from United States (AS14061, DigitalOcean, LLC) has been observed in 9 honeypot sessions targeting SIP protocols. First observed on April 5, 2026, most recently active April 5, 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.