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VoIP is voice communication over IP networks, where exposed services and flawed configurations can enable interception, fraud, or service disruption.

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Voice over Internet Protocol (VoIP) carries voice and related communications as IP network traffic, typically separating call signaling—often SIP—from audio or video media—often RTP. It includes internet calling services and enterprise phone systems such as IP-PBXs, session border controllers, handsets, and management portals.

Its security depends on both the VoIP applications and the networks they use. Internet-exposed SIP services and weakly protected accounts can enable unauthorized calling (toll fraud), call-routing changes, or denial-of-service; unencrypted or misconfigured media can expose conversations. Practitioners should restrict and authenticate signaling and administration, patch PBX and session-border software, use TLS and SRTP where supported, segment voice systems, and monitor registrations, call records, and unusual destinations. Vulnerability management must cover phones, servers, web interfaces, and integrations, while logs and call-routing data require appropriate privacy controls.

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Don't laugh: The $4.5m fine proposed for carrier Telnyx shows how the Trump administration will run its comms regulator In its first enforcement action of the Trump presidency, the FCC has voted to propose fining Telnyx $4,492,500 – after scammers pretending to be the watchdog's staff started calling actual FCC staffers via the VoIP telco.…

The Register 6 Feb 2025, 1:04 p.m. Fine Proposal Telco VoIP

Threat hunters traced it back to malware-laced Trading Technologies' software The supply-chain attack against 3CX last month was caused by an earlier supply-chain compromise of a different software firm — Trading Technologies — according to Mandiant, whose consulting crew was hired by 3CX to help the VoIP biz investigate the intrusion.…

The Register 21 Apr 2023, 12:00 a.m. 3CX Compromise Malware Supply Chain VoIP