Modular telephony
Field-upgradable cards support up to 8 E1/T1 PRI ports or up to 28 BRI, FXS and FXO interfaces, depending on configuration.
Products
Sentinel 400 SBC & Gateway
A modular SBC and media gateway. S5 hardware supports up to 2,000 SBC sessions and 6,000 registered users; gateway capacity depends on the installed modules.
Up to 2,000 SBC sessions (S5)
Up to 240 voice channels
PRI, BRI, FXS and FXO options
Which Sentinel 400 generation are you selecting?
Sentinel 400 combines an SBC and a modular media gateway. The S5 hardware generation supports up to 2,000 SBC sessions and 6,000 registered users. Gateway capacity reaches up to 240 voice channels with the appropriate modules. Confirm hardware code, licenses and interface configuration when ordering.
The earlier S1 generation was documented at 600 SBC sessions and 2,000 registrations. The S1 end-of-life notice takes effect on 31 March 2027. S5 hardware requires DGW 48.3 or later; confirm the release required by the application. Registered users, sessions and gateway voice channels are separate limits.
MODULAR SBC + MEDIA GATEWAY
What you can do with it
Sentinel 400 is a modular multi-service platform combining session border control, media gateway functions and a virtualization server for medium and large enterprise voice environments.
2,000 (S5)concurrent SBC sessions
6,000registered users
240voice channels
CAPABILITIES
Capabilities that matter for your project
Secure interconnection
Rule-based SBC routing, SIP normalization, TLS 1.3, SRTP, topology hiding and call admission control secure the voice edge.
Integrated services
The platform supports up to five virtual machines for approved third-party applications and operational consolidation.
DEPLOYMENT FIT
Best suited for
- Microsoft Teams Direct Routing
- Large SIP trunk deployments
- TDM-to-SIP migration
- Multi-site enterprise voice
- Third-party application integration
KEY SPECIFICATIONS
Important selection data
Telephony interfacesUp to 8 PRI or up to 28 BRI/FXS/FXO, configuration dependent
Networking5 × 1 GbE, IPv4/IPv6, VLANs, QoS, firewall and routing
PowerSingle or dual internal 100–240 VAC
Form factor1U; 48.5 × 33.0 × 4.4 cm
DOWNLOADS
Brochures and technical documents
Download the PDF files directly. Use the documentation portal for configuration guides, installation procedures and release-specific information.
REFERENCE ARCHITECTURE
See Sentinel 400 SBC & Gateway in the complete voice path.
A product decision is only correct when both sides of the interface, the security boundary and the operating model are considered together.
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.
OPTIONAL FOR EXTERNAL SERVICES
SIP carrier, PSTN, Teams or cloud
An external connection is used only when calls must reach public numbers, remote sites or hosted services. If the required call path is entirely local, the system can stay on the private network.
PRIVATE CUSTOMER NETWORK
Enterprise PBX
Existing call control and dial plans remain on the trusted side.
Users & contact center
Approved calls reach phones, agents and business applications.
Mediatrix gateway
Analog phones, fax, modems or PBXs can enter the SIP architecture without bypassing policy.
PRIVATE IP NETWORK / LANLocal SIP signaling + RTP media
INTERNALSECURITY BOUNDARY
SBC + GATEWAY
Sentinel 400
Modular SBC, media gateway and virtualization platform for larger hybrid estates.
OPTIONAL EXTERNAL SERVICES
Microsoft Teams Phone
Cloud users connect through a certified Direct Routing boundary.
SIP carrier
Public numbers and inbound or outbound calling arrive from the service provider.
SIP over TLSEncrypted mediaPolicy routingLegacy interworking
READING THE DIAGRAM
Why the SBC sits in the middle
- 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.
- Mediatrix gateway
- Converts analog or digital voice interfaces into SIP/IP while preserving validated legacy equipment.
Conceptual architecture — final topology, capacity and interface configuration require validation.
PLATFORM SELECTION
One DGW security model. Four deployment profiles.
Start with scale and deployment model, then validate interfaces, high availability, carrier interoperability and lifecycle requirements.
Published maximums are selection guides, not a substitute for sizing against codec, transcoding, recording, redundancy and traffic assumptions.| Selection factor | Sentinel Mini | Sentinel 100 | Sentinel 400 | Sentinel CS |
|---|---|---|---|---|
| Deployment | Compact appliance | 1U appliance | Modular 1U appliance | Virtual / cloud |
| Concurrent sessions | Up to 400 | Up to 120 | Up to 2,000 (S5) | Up to 20,000 |
| Registered users | Up to 1,200 | Up to 500 | Up to 6,000 | Up to 30,000 |
| Legacy voice | External gateway | Optional interfaces | Modular PRI / BRI / FXS / FXO | External gateway |
| Typical fit | Branches and focused edges | SMB and hybrid sites | Large hybrid voice environments | Centralized and cloud voice |
FREQUENTLY ASKED
What to know before the next step.
Confirm deployment model, concurrent sessions, registered users, interfaces, codecs, carriers, resilience and operational ownership before choosing the final model or SKU.
Validate the exact hardware or virtual configuration, DGW release, license, power, interface modules, interoperability and support coverage.
Use the linked M5 data sheet for selection and the Media5 documentation portal for configuration, installation and release-specific guidance.
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.
B2B BUYER GUIDE
When is a hybrid SBC and media gateway useful?
A hybrid platform is useful when a site needs both SIP session control and connectivity to legacy telephony. Sentinel 400 combines SBC and media gateway capabilities. Match its ordered configuration to the interfaces you must retain and plan the cutover so existing and new services can be tested together.
| Criterion | Assessment |
|---|---|
| Physical interfaces | Inventory every analog and digital circuit and confirm the exact supported interface configuration. |
| SIP services | Define the PBX, carrier, numbering and media requirements on both sides of the border. |
| Migration | Pilot one representative site, document rollback and agree a production maintenance window. |
Buyer questions
Is Sentinel 400 the same as a virtual SBC?
No. Sentinel 400 is a hybrid hardware platform; Sentinel CS is a virtual SBC. Choose according to your physical interface and hosting requirements.
Can I preserve my existing PBX?
A phased migration may be possible, subject to the PBX interfaces, SIP behavior and tested interoperability. Submit the model and software version for review.
Prepare a request for your market
Include your country, sites, SIP provider, existing equipment, capacity and timeframe. M5 can identify the interoperability questions, local requirements and evaluation steps to confirm.
Request an architecture reviewRead the reference documentation
Publisher: M5 Technologies (Media5 Corporation). This guide revised: