Analog-to-SIP migration
Preserve selected analog phones, fax machines and modems while moving service delivery to SIP and cloud telephony.
Products
Mediatrix 4102 / 4102S
A secure two-port FXS VoIP adapter for connecting analog phones, fax machines and modems to SIP, cloud telephony and PSTN-replacement services.
Select the right Mediatrix 4102 / 4102S reference
Share the exact model, connected analog devices, quantities, SIP service and installation country. Our team can help identify the appropriate purchasing path.
Request a Mediatrix 4102 Quotation2 FXS ports
T.38 and G.711 fax
Zero-touch provisioning
2-PORT ANALOG TELEPHONE ADAPTER
What you can do with it
Mediatrix 4102S is a secure VoIP analog adaptor that connects two analog telephones, fax machines or modems to SIP services for branch, SMB and PSTN-replacement deployments.
2 FXSanalog device ports
4voice channels
T.38fax over IP support
CAPABILITIES
Capabilities that matter for your project
Reliable fax and modem transport
Real-time T.38 and G.711 clear-channel pass-through provide two validated transport approaches.
Secure mass deployment
Zero-touch provisioning, TLS 1.3, SRTP, certificates, TR-069 and remote management support operator-scale rollouts.
DEPLOYMENT FIT
Best suited for
- PSTN and POTS replacement
- Cloud telephony at branches
- Fax and modem migration
- Hosted UC analog endpoints
- Legacy PBX extensions
KEY SPECIFICATIONS
Important selection data
Analog interfaces2 × RJ-11 FXS
Ethernet2 × 10/100 Base-T RJ-45
SecurityTLS 1.3, SRTP, X.509, OCSP and DoS protection
Dimensions12.7 × 9.9 × 3.1 cm; 170 g
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 Mediatrix 4102 / 4102S 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.
ANALOG / LEGACY EQUIPMENT
Analog telephone
The gateway provides the analog station interface and converts the call to SIP.
Fax machine
T.38 or G.711 behavior must be accepted by the carrier and tested end to end.
Analog modem
Data-over-audio is sensitive to codecs, jitter and packet loss and may require pass-through testing.
FXS / FXO / PRI / BRI
2 × FXS
Mediatrix 4102 / 4102S
Two FXS ports connect two validated analog devices to SIP.
PRIVATE CUSTOMER NETWORK
PRIVATE IP NETWORK / LANLocal SIP signaling + RTP media
INTERNALLocal IP PBX / call server
Controls extensions and internal routing on the private network. It may remain fully on-premises.
Local calls stay localPhones and the on-site PBX can communicate without a public Internet connection.
OPTIONAL EXTERNAL PATH
SIP service
Provides telephone numbers and PSTN connectivity.
Cloud PBX / Teams
Hosted call control is reached through the correct SIP and SBC architecture.
Analog electrical interfaceDGW conversionSIP signalingRTP media
READING THE DIAGRAM
What the gateway changes—and what it does not
- Phone or endpoint
- Creates or receives a call. An analog endpoint needs an FXS interface; an IP phone connects directly to the data network.
- Fax or modem
- Sends data as audio. It must be tested through the complete gateway, network and carrier path—not only for dial tone.
- Mediatrix gateway
- Converts analog or digital voice interfaces into SIP/IP while preserving validated legacy equipment.
- Cloud voice platform
- Hosts communications services such as Microsoft Teams Phone or CCaaS outside the customer site.
Conceptual architecture — final topology, capacity and interface configuration require validation.
GATEWAY SELECTION
Match the interface to the field requirement.
Port count alone is not enough. Endpoint behavior, line length, signaling, fax or modem transport, power and carrier acceptance all affect the final choice.
Always validate the exact SKU, interface modules and supported endpoint behavior before ordering or replacing an active line.| Selection factor | 4102 / 4102S | C7 Series | G7 Series | S7 / S7 LP |
|---|---|---|---|---|
| Primary role | Two-port analog adapter | Compact multi-interface gateway | Digital and analog media gateway | High-density FXS gateway |
| Interfaces | 2 FXS | FXS / FXO / BRI by model | PRI / BRI / FXS / FXO by model | 16 or 24 FXS |
| Deployment fit | Small site or single service | Branch and mixed legacy edge | PBX and TDM modernization | Campus and high-density analog |
| Special consideration | Fax / modem validation | Exact model configuration | Trunk and channel design | S7 LP for validated long-loop needs |
FAQ — Mediatrix 4102 / 4102S
What analog equipment can I connect?
The Mediatrix 4102S connects compatible analog telephones, fax machines and modems to SIP systems. Confirm the endpoint and service configuration before deployment.
How many analog ports does it provide?
Two physical RJ-11 FXS ports, plus separate LAN and WAN 10/100 Ethernet ports. Voice processing channels do not represent additional physical connectors.
Are 4102 and 4102S specifications interchangeable?
The downloadable datasheet describes the 4102S. For an existing 4102, confirm its exact hardware and firmware before applying these specifications or ordering a replacement.
How is the 4102S powered?
It uses an external 12 VDC, 1.5 A power supply. The supplied datasheet specifies a 100–240 VAC input supply.
Does it support fax and modem transmission?
The 4102S supports T.38 fax and G.711 fax/modem pass-through. T.38 requires compatible support at both ends; validate the actual service and endpoint combination. Alarm, elevator and emergency applications require separate validation of their complete operating requirements.
How do I select a reference and request a quotation?
Provide your installed model, SIP provider, analog devices, quantities and installation country. Review required SIP features with M5 and use the quotation or distributor links on this page.
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