01
SIP trunks
Public interconnection can expose signaling, credentials, routes and capacity.
Telecom Cybersecurity
Protect your voice infrastructure before attackers find it.
Secure SIP trunks, Microsoft Teams Phone, SBCs, gateways and critical voice infrastructure against toll fraud, SIP attacks, service disruption and unauthorized access.
SIP Trunk Security
SBC Protection
TLS & SRTP
Toll Fraud Mitigation
Secure SIP borderControl external signaling, routing and topology.
Fraud reductionReduce unauthorized calling and routing abuse.
Media protectionUse TLS and SRTP where supported by the architecture.
Critical continuityProtect voice services that cannot tolerate disruption.
Secure voice perimeterThreat surface → Sentinel SBC → trusted communications
External threat surface
InternetSIP trunksCloud voiceRemote endpointsUntrusted traffic
↓
Sentinel SBC security layer
Topology hidingSIP normalizationRouting policyTLS / SRTPAccess control
↓
Trusted voice infrastructure
Microsoft TeamsPBXContact centerMediatrix gatewaysCritical endpoints
ProtectReduce voice-edge exposure.
ControlApply explicit SIP policy.
MonitorIdentify abnormal activity.
30+ Years of SIP ExpertiseTelecom engineering across enterprise and operator networks.
Sentinel SBC PortfolioVirtual and appliance options for secure SIP interconnection.
Microsoft Teams Direct RoutingSupported certified SBC models for applicable Teams deployments.
Critical CommunicationsSecurity architecture for high-availability voice environments.
Is your voice network exposed?
Voice systems are now part of the cybersecurity perimeter.
SIP trunks, cloud voice, Teams Direct Routing, remote endpoints and legacy gateways create specialized attack surfaces that traditional network security may not fully understand.
02
Microsoft Teams voice
Direct Routing must be designed with supported SBC connectivity and secure SIP control.
03
Legacy PBX systems
Older platforms may lack modern hardening, monitoring and encryption options.
04
Analog and media gateways
Gateway deployments can become unmanaged entry points if routing and access are weak.
Common SIP attacks
Threats that target voice signaling, routing and media.
01
INVITE Flood
High volumes of call requests consume signaling and session resources.
02
REGISTER Attack
Unauthorized registration attempts target user identities and credentials.
03
OPTIONS Scanning
Attackers probe SIP services to identify active endpoints and platforms.
04
Toll Fraud
Unauthorized calls and route abuse create direct financial loss.
05
SIP Enumeration
Repeated requests attempt to discover extensions, users and services.
06
RTP Interception
Unprotected media paths may expose voice conversations.
07
Credential Attacks
Password spraying and credential reuse target SIP accounts and portals.
08
Call Pumping
Automated calling patterns generate cost, load or revenue abuse.
SBC vs traditional firewall
A network firewall and an SBC protect different layers.
| Criteria | Traditional Firewall | Session Border Controller |
|---|---|---|
| Primary focus | IP addresses, ports, protocols and network sessions | SIP signaling, voice sessions, media and telecom policy |
| SIP awareness | Varies by product and configuration | Purpose-built for SIP parsing, normalization and routing |
| Topology hiding | Limited telecom context | Designed to hide internal SIP and network topology |
| Media control | General network inspection | Can control RTP/SRTP paths and session anchoring |
| Best approach | Protect the general network perimeter | Use alongside network security for the voice perimeter |
Encryption comparison
SIP over UDP vs SIP over TLS, and RTP vs SRTP.
| Technology | Role | Security consideration |
|---|---|---|
| SIP over UDP | Unencrypted signaling transport | Simple and common, but does not encrypt signaling content |
| SIP over TLS | Encrypted signaling transport | Protects signaling in transit when supported and correctly configured |
| RTP | Voice media transport | Media may be exposed if intercepted |
| SRTP | Encrypted media transport | Protects voice media when supported end to end |
Microsoft Teams voice security
Direct Routing security starts with a supported certified SBC architecture.
Supported certified Sentinel SBC models can be used in applicable Microsoft Teams Direct Routing deployments. Certification applies to specific SBC products and software versions, not to gateways, Audiotrix products or the entire voice environment.
01
Supported SBC Connectivity
Use a currently supported certified Sentinel model for the planned Direct Routing architecture.
02
SIP Boundary Control
Apply routing, topology hiding, normalization and access control between Teams and enterprise voice.
03
Legacy Integration
Use Mediatrix gateways where analog, PRI, BRI or PBX systems must remain connected.
Reference architecture
Protect the communications path from the public edge to trusted voice systems.
Internet & CarriersPublic SIP, cloud voice, remote endpoints and external networks
→
Sentinel SBCSIP security, routing, normalization, topology hiding and media control
→
Trusted Voice PlatformsMicrosoft Teams, PBX, contact center and UC systems
→
Mediatrix GatewaysAnalog, PRI, BRI and legacy endpoint interworking
Who needs telecom cybersecurity
Voice security for regulated, distributed and high-impact environments.
Banks & Financial ServicesSecure customer communications, branches and regulated voice systems.
GovernmentProtect public-sector voice, emergency operations and sensitive communications.
HospitalsSecure clinical, administrative and emergency voice services.
Airports & TransportationProtect operations centers, terminals, stations and distributed endpoints.
UtilitiesSecure voice across remote sites and critical infrastructure.
DefenseControl SIP interconnection and mission-sensitive voice environments.
ManufacturingProtect plant communications, intercoms and operational voice.
Telecom OperatorsSecure SIP trunks, peering, hosted voice and subscriber communications.
Why M5 Technologies
Specialized telecom security across SBCs, gateways and SIP software.
01
SIP Security Expertise
Focused experience in signaling, routing, interoperability and telecom edge control.
02
Sentinel SBC Portfolio
Virtual and appliance platforms for enterprise and operator SIP protection.
03
Mediatrix Gateways
Controlled modernization of analog, PRI, BRI and PBX environments.
04
Critical Voice Continuity
Security architecture for communications that cannot tolerate uncontrolled downtime.
Telecom Cybersecurity FAQ
Questions security, IT and telecom teams ask before an assessment.
What is telecom cybersecurity?
Telecom cybersecurity protects voice systems, SIP trunks, SBCs, gateways, media streams and communications infrastructure from fraud, unauthorized access and service disruption.
Why are SIP trunks a security risk?
SIP trunks connect voice systems to external providers and networks, exposing signaling, routing and service capacity if controls are weak.
What is toll fraud?
Toll fraud is unauthorized use of a voice system to place calls that create financial cost or route abuse.
What is a SIP flood?
A SIP flood sends large volumes of signaling requests to consume resources or disrupt service.
Why use an SBC instead of only a firewall?
An SBC understands SIP sessions, telecom routing, topology and media behavior, while a traditional firewall focuses on general network traffic.
Does TLS secure SIP?
TLS can encrypt SIP signaling in transit when both sides support it and certificates are correctly configured.
Does SRTP secure voice media?
SRTP encrypts media streams when supported throughout the communications path.
Can Microsoft Teams Direct Routing be secured with Sentinel?
Supported certified Sentinel SBC models may be used in applicable Teams Direct Routing architectures, subject to current product and software support.
Are Mediatrix gateways Microsoft Teams certified?
No. Mediatrix gateways are not SBCs and should not be described as Microsoft Teams Direct Routing certified.
Are Audiotrix products Microsoft Teams certified?
No. Audiotrix products are not Microsoft Teams Direct Routing certified.
Can M5 assess toll fraud risk?
M5 can help review SIP trunks, routing, SBC policy, exposure, authentication and operational controls at a high level.
What should be included in a security review?
Include SIP trunks, carriers, SBCs, PBXs, Teams, gateways, encryption, routing, remote access, monitoring and incident history.
Telecom Security Assessment
Find the voice-edge risk before it becomes fraud or downtime.
Share a high-level overview of your environment. M5 can help identify where SBC, SIP, routing, encryption, gateway or operational controls may need improvement.
- SIP trunks, carriers and public interconnection
- Microsoft Teams, PBX and cloud voice
- Sentinel SBC and Mediatrix gateway architecture
- Toll fraud, suspicious activity and service disruption
- TLS, SRTP, routing and access-control requirements