Mitel's infrastructure handles roughly two billion connections daily across a customer base of 60 million, with operations spanning Western Europe and global markets. The company, founded in 1973, builds unified communications, cloud and hybrid platforms, contact center solutions, and collaboration tooling. That scale means the threat surface is massive - voice, data, and real-time collaboration channels all converging on a single stack, with uptime and data integrity as non-negotiable constraints.
For security teams, the domain is communications infrastructure: securing hybrid cloud deployments, protecting session border controllers, hardening SIP and VoIP protocols, and defending against toll fraud, eavesdropping, and denial-of-service attacks targeting real-time media. The attack vectors here aren't theoretical - telecom-adjacent platforms are active targets for nation-state actors and financially motivated groups exploiting signaling protocols and credential reuse.
Mitel holds the top market share position in Western Europe, generating over $1 billion in combined annual revenue. Security work at this scale requires teams comfortable operating across network security, application security, and identity domains, with an emphasis on securing communications protocols that most enterprise security teams rarely encounter.
