Telecommunications Cybersecurity Services in Canada

SIM swapping is among the highest-impact attack methods targeting Canadian telecom customers, and the telecom company's customer service infrastructure is the point of compromise. An attacker who convinces a carrier's customer service representative to transfer a target's phone number to a SIM card the attacker controls gains the ability to intercept SMS-based one-time passwords, reset banking and email passwords, and drain accounts before the victim is aware anything has happened. Canadian victims have lost hundreds of thousands of dollars in cryptocurrency and banking funds through SIM swap attacks. The weakness is not primarily technical — it is procedural: social engineering scripts exploit inconsistent identity verification practices, gaps between in-store and phone channel authentication requirements, and customer service representatives who prioritize customer satisfaction over security friction. Carriers have implemented number transfer protection features, but these are often opt-in rather than default.

SS7 (Signalling System No. 7) protocol vulnerabilities affect all carriers that participate in the global telephone network, including Canadian carriers. SS7 was designed in the 1970s with an implicit trust model that assumes all network nodes are operated by legitimate carriers — a trust model that no longer reflects reality. Attackers with access to an SS7 node (which can be obtained by registering a carrier in a permissive jurisdiction or by compromising a legitimate carrier's infrastructure) can redirect calls and SMS messages, track subscriber location in real time, and intercept communications without the target's knowledge. The CRTC's DNS security requirements and broader network security obligations for carriers reflect a regulatory environment that is increasingly attentive to core network vulnerabilities, though SS7 remediation requires international coordination beyond any single regulator's authority.

VoIP fraud, specifically International Revenue Share Fraud (IRSF), costs the global telecommunications industry billions of dollars annually and Canadian VoIP providers are not immune. IRSF works by compromising a business's PBX system or SIP trunk credentials, then using them to generate large volumes of calls to premium-rate numbers in foreign jurisdictions where the fraudster collects a share of the termination revenue. A single weekend of fraudulent traffic can generate charges of tens of thousands of dollars on a business's account. Canadian VoIP providers face both the direct cost of fraud where they absorb losses and the reputational cost of customer disputes. Toll fraud detection — anomaly monitoring on call destinations, volumes, and timing — is not optional for any VoIP provider operating in Canada, and the CRTC's robocall and STIR/SHAKEN requirements create additional compliance obligations for carriers managing voice traffic authentication.

Lawful intercept infrastructure represents a uniquely sensitive attack surface for telecommunications companies. Canadian carriers are required under the Telecommunications Act to maintain the technical capability to assist law enforcement with court-authorized interception of communications. This infrastructure is a high-value target for foreign intelligence services precisely because it provides a mechanism to access communications at the network level. The compromise of lawful intercept infrastructure at a major carrier provides access to court-ordered interceptions in progress, law enforcement investigation targets, and the metadata of surveillance activity itself. Customer care teams are also a persistent phishing and social engineering target: a successful compromise of a customer service account can enable account takeover on behalf of a customer without any technical network access required.