Secure demarcation
Hide internal topology and credentials while inspecting and authorizing inbound and outbound sessions.
Solutions
Secure SIP Trunking
Protect SIP trunks with policy enforcement, encryption, topology hiding, normalization and controlled interconnection.
TLS and SRTP
Topology hiding
SIP policy control
SECURE SIP TRUNKING
What you can do with it
Create a controlled demarcation point between carrier SIP trunks and enterprise communications with policy enforcement, normalization, encryption and topology protection.
TLS 1.3signaling protection
SRTPmedia encryption
CACadmission control
CAPABILITIES
Capabilities that matter for your project
Normalize SIP
Adapt carrier, PBX and UC signaling through rule-based routing and header manipulation.
Control quality and capacity
Apply call admission control, QoS, traffic shaping, monitoring and failover policies.
DEPLOYMENT FIT
Best suited for
- Carrier trunk migration
- Multi-carrier routing
- PBX security
- UC interconnection
- Managed SIP services
KEY SPECIFICATIONS
Important selection data
PlatformsSentinel SBC portfolio
TransportSIP over UDP, TCP and TLS
MediaRTP/SRTP interworking and codec policy
DOWNLOADS
Brochures and technical documents
Download the PDF files directly. Use the documentation portal for configuration guides, installation procedures and release-specific information.
Products to compare
A starting point for your project. Review the model data sheet before ordering.
Sentinel Mini SBC
A compact SBC for a branch or a dedicated SIP edge.
- Selection criterion
- Required sessions, network ports, power supply and license.
Sentinel 400 SBC & Gateway
A modular voice edge for sites with mixed telephony interfaces.
- Selection criterion
- Interface modules, session license, power and resilience requirements.
Sentinel CS Virtual SBC
An SBC deployed on your virtual infrastructure.
- Selection criterion
- Supported hosting environment, CPU resources and licensed capacity.
SOLUTION BLUEPRINT
How Secure SIP Trunking changes the voice path.
The M5 layer sits between what must be preserved and the destination architecture, making security, translation and failure behavior explicit.
NO PUBLIC INTERNET REQUIRED
Private LAN / isolated IP network
Local phones, a local IP PBX, Mediatrix gateways and Sentinel can exchange SIP calls entirely inside the organization. The voice path can remain on a private LAN, VLAN, campus network or isolated operational network.
REQUIRED FOR OFF-SITE / PSTN CALLS
Carrier SIP trunk
The carrier path is needed only for calls that leave the private voice domain or arrive from public telephone numbers. Internal extension-to-extension calls can stay local.
PRIVATE CUSTOMER NETWORK
Secondary carrier
Provides an alternate route only when failover is designed and tested.
PBX / UC server
Owns extensions, call features and internal dial plans.
Users & contact center
Place and receive calls through the enterprise platform.
Operations
Reviews alarms, call records, certificates and configuration state.
PRIVATE IP NETWORK / LANLocal SIP signaling + RTP media
INTERNALSECURITY BOUNDARY
TRUST BOUNDARY
Sentinel SIP boundary
Creates a controlled demarcation for identity, routes, media, capacity and failure behavior.
OPTIONAL EXTERNAL SERVICES
Primary SIP carrier
Delivers public calling with its own SIP profile and routing rules.
Normalize SIPHide topologyControl sessionsFail over
READING THE DIAGRAM
The SBC is the controlled border between two voice domains
- Sentinel SBC
- Secures and normalizes SIP between voice domains, controls media and routing, and hides the internal network.
- SIP carrier
- Connects the organization to the public telephone network and supplies telephone numbers and external call routes.
- PBX or call server
- Controls extensions, features and call routing. It may run on-site, in a data center or as a hosted service.
- Operations
- Owns monitoring, backups, certificates, software lifecycle and the response when a route or carrier fails.
Reference flow — carrier, platform, jurisdiction and field requirements determine the production design.
BEFORE / AFTER
Turn an uncontrolled migration into an engineered transition.
Use these checkpoints to evaluate a secure sip trunking project before product selection or cutover.
The recommended design depends on the deployed carrier, PBX or UC platform, interfaces, call volume, failure modes and regulatory context.| Decision area | Uncontrolled approach | M5 architecture | Acceptance evidence |
|---|---|---|---|
| Interoperability | Assume systems will connect | Normalize signaling and media at a defined boundary | Documented end-to-end call tests |
| Security | Expose internal voice domains | Apply identity, topology and transport controls | Approved routes, certificates and logs |
| Continuity | Cut over every site together | Preserve required services and phase migration | Failover, rollback and exception tests |
| Operations | Treat go-live as the finish line | Assign monitoring, updates and escalation ownership | Runbook, backups and support entitlement |
FREQUENTLY ASKED
What to know before the next step.
Document every carrier, PBX or UC platform, endpoint class, site, interface, call flow, security boundary and failure requirement.
Yes. A phased architecture can preserve approved services while routes, sites and users move in controlled stages with rollback criteria.
Normal and exceptional calls, encryption, routing, media, failover, monitoring and operational ownership should all pass documented tests.
READY FOR THE NEXT STEP?Request a free review
Build the right voice architecture.
Share the product, deployment and target outcome. M5 will identify the right technical and commercial path.