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172.110.223.61 has a very high threat confidence level of 92%, originating from Hong Kong, on the ReliableSite.Net LLC network (23470). It has been observed across 170 sessions targeting SIP, First observed on February 21, 2026, most recently active March 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.