01
POTS retirement
Traditional copper services are becoming harder and more expensive to maintain.
Mediatrix 4102S • Secure 2-FXS ATA
Keep your analog devices. Modernize everything else.
Preserve analog phones, fax machines, modems and selected legacy endpoints while migrating to secure SIP, cloud PBX, hosted voice or modern enterprise communications.
2 FXS portsConnect two analog phones, fax machines or compatible endpoints.
Secure SIPSIP over TLS, SRTP, certificates and TLS 1.3 support.
Fax-readyT.38 and G.711 fax or modem pass-through.
Managed deploymentTR-069, SNMP, zero-touch and HTTPS provisioning.
Mediatrix 4102S
2 FXS • SIP • TLS • SRTP • T.38
FXS 1
FXS 2
LAN
WAN
2 × RJ-11FXS analog
2 × RJ-4510/100 Ethernet
IPv4 / IPv6Dual-stack networking
Cloud PBXConnect analog devices to hosted SIP and cloud telephony services.
POTS migrationReplace legacy copper transport while retaining compatible endpoints.
Fax & modemSupport T.38 and clear-channel G.711 transmission.
Mass provisioningAutomate deployment through secure remote-management tools.
The customer problem
Analog devices still work, but the network around them is changing.
Organizations often need to preserve phones, fax machines, modems and other analog equipment even as carriers retire copper lines and enterprises move to SIP or cloud communications.
02
Working analog assets
Replacing every phone, fax machine or legacy device may be unnecessary and costly.
03
Generic ATA limitations
Basic adapters may lack provisioning, security, diagnostics or carrier-grade controls.
04
Migration complexity
Fax, DTMF, routing, NAT, QoS and SIP behavior must be validated together.
Customer impact: selecting the wrong ATA can create unreliable fax, inconsistent call behavior, poor remote management and higher support costs across multiple sites.
ATA comparison
Generic ATA vs enterprise ATA vs Mediatrix 4102S.
The exact capabilities of competing products vary by model and software version. This comparison focuses on the typical differences buyers should evaluate.
| Criteria | Basic / Generic ATA | Typical Enterprise ATA | Mediatrix 4102S |
|---|---|---|---|
| Analog ports | Often 1–2 FXS | Commonly 2 FXS | 2 RJ-11 FXS ports |
| SIP transport | Usually UDP; TCP/TLS varies | UDP, TCP and TLS may be available | SIP 2.0 over UDP, TCP and TLS |
| Media security | Variable or absent | SRTP commonly available | SRTP with AES 128-bit |
| TLS version | Model dependent | Model and release dependent | TLS 1.3 support |
| Fax support | Variable T.38 implementation | T.38 and G.711 commonly available | T.38 plus G.711 fax/modem pass-through |
| Remote provisioning | Often limited | Vendor-specific provisioning | TR-069, TR-104, TR-111, FTP, TFTP, HTTP and HTTPS |
| Network features | Basic DHCP and NAT | VLAN and QoS commonly available | IPv4/IPv6, VLAN, QoS, PPPoE, LLDP-MED, firewall and routing |
| Monitoring | Basic logs | Vendor diagnostics | SNMP, traps, CDR, RTCP-XR, eMOS, packet and PCM capture |
| Best fit | Low-cost, simple endpoint conversion | Standard enterprise ATA deployments | Managed enterprise, carrier, branch and analog-migration projects |
M5 platform comparison
When to choose 4102S, C7, G7 or Sentinel 400.
| Platform | Best for | Typical interfaces | Recommended scenario |
|---|---|---|---|
| Mediatrix 4102S | Small analog migrations | 2 FXS + LAN/WAN | Two analog devices, fax, branch phone or limited POTS replacement |
| Mediatrix C7 Series | Multi-port analog deployments | Multiple FXS configurations | Buildings, campuses and larger analog endpoint groups |
| Mediatrix G7 Series | Complex legacy migration | Analog, PRI, BRI, FXO and SIP options | PBX, carrier and mixed digital/analog transformation |
| Sentinel 400 | Secure hybrid voice edge | SBC plus gateway capabilities | Teams, SIP trunks, PBX coexistence and policy-controlled migration |
Use cases
Where the 4102S creates the most value.
Cloud PBX migration
ProblemAnalog phones must connect to hosted voice without replacement.
4102S roleConverts two analog endpoints to managed SIP services.
OutcomePreserve devices while moving the service to the cloud.
Fax over IP
ProblemFax workflows remain operational after PSTN retirement.
4102S roleT.38 and G.711 fax or modem pass-through.
OutcomeRetain compatible fax equipment on SIP infrastructure.
Branch-office analog voice
ProblemSmall offices need one or two analog lines inside a modern network.
4102S roleCompact local FXS conversion with central provisioning.
OutcomeStandardized deployment and reduced site-support effort.
Legacy PBX interworking
ProblemSelected analog interfaces must remain during PBX migration.
4102S roleProvides SIP-to-FXS interworking and call-routing controls.
OutcomeMove to IP voice in manageable stages.
POTS replacement
ProblemA compatible analog endpoint remains after copper-line retirement.
4102S roleMoves the endpoint to SIP transport.
OutcomeReduce copper dependency without replacing the endpoint.
Managed multi-site rollout
ProblemMany small locations require repeatable ATA deployment.
4102S roleZero-touch, TR-069, SNMP and secure provisioning.
OutcomeCentralized management and consistent configuration.
Deployment architecture
From analog endpoint to secure enterprise voice.
Analog endpointPhone, fax, modem or compatible legacy device
→
Mediatrix 4102SFXS, SIP, T.38, routing and secure provisioning
→
Sentinel SBCOptional SIP security, carrier control and interoperability
→
Voice platformCloud PBX, SIP carrier, IP-PBX, UC or Teams architecture
Technical specifications
Core specifications organized for engineering and procurement.
Specifications should be validated against the applicable product documentation, software release and regional configuration before final deployment.
Interfaces
- Analog
- 2 × RJ-11 FXS ports
- Ethernet
- 2 × RJ-45 10/100 Base-T LAN/WAN ports
- Power
- External 12 Vdc, 1.5 A input
SIP & Media
- SIP
- SIP 2.0, RFC 3261
- Transport
- UDP, TCP and TLS
- Codecs
- G.711 A-law/µ-law, G.726 and G.729a/b
- DTMF
- In-band, RFC 2833 and SIP INFO
Fax & Analog Features
- Fax
- T.38 real-time fax
- Pass-through
- G.711 fax and modem pass-through
- Call features
- Forward, transfer, waiting, hold and 3-way conference
- Signaling
- Caller ID, MWI, distinctive ringing and configurable tones
Security
- Signaling
- SIP over TLS
- Media
- SRTP with AES 128-bit
- Certificates
- X.509 certificate management and OCSP verification
- Protection
- DoS protection and secure management
Networking
- IP
- IPv4 and IPv6 dual stack
- VLAN / QoS
- 802.1Q, 802.1p and DSCP
- Access
- DHCP client/server, PPPoE and 802.1X
- Routing
- NAT/NAPT, static routing and stateful firewall
Provisioning & Management
- Provisioning
- FTP, TFTP, HTTP and HTTPS
- Protocols
- TR-069, TR-104 and TR-111
- Management
- Web GUI, SSH, Telnet and SNMP v1/v2c/v3
- Diagnostics
- CDR, RTCP-XR, eMOS, packet capture and traces
Why Mediatrix 4102S
Built for deployments that need more than basic analog conversion.
Secure migrationProtect signaling, media and remote configuration.
Operational visibilityUse diagnostics, monitoring and centralized management.
Flexible integrationConnect cloud PBX, carriers, IP-PBX and broader M5 architectures.
Lower support burdenStandardize configuration and multi-site deployment.
FAQ
Questions buyers and engineers ask about the 4102S.
What is the Mediatrix 4102S?
It is a two-port FXS analog telephone adapter that connects compatible analog phones, fax machines, modems and legacy endpoints to SIP-based communications systems.
Can the 4102S replace a POTS line?
It can form part of a POTS replacement architecture by moving compatible analog endpoints to SIP transport. The complete application, power, emergency and regulatory requirements must be validated.
Does the 4102S support fax?
Yes. It supports T.38 fax and clear-channel G.711 fax or modem pass-through.
Can it connect to Microsoft Teams?
The 4102S does not connect directly to Teams Phone as a certified SBC. It can be used in a broader architecture with a Microsoft-certified Sentinel SBC and compatible routing design.
Which security features are included?
Security capabilities include SIP over TLS, SRTP, certificate management, OCSP verification, TLS 1.3, DoS protection and secure remote management.
How is the device provisioned?
Provisioning options include FTP, TFTP, HTTP, HTTPS, TR-069, TR-104, TR-111, Web GUI, SSH and SNMP.
When should I choose a C7 or G7 instead?
Choose a C7 for more analog ports and a G7 when the project requires larger or mixed analog, PRI, BRI, FXO, PBX or carrier interfaces.
Is every analog device automatically compatible?
No. Device behavior, line signaling, power, fax, alarm, elevator and emergency requirements must be tested for the intended deployment.
4102S product review
Validate the ATA, SIP platform and analog endpoint before deployment.
Provide a high-level description of the devices, sites, carrier or PBX environment and expected quantity. M5 can help determine whether the 4102S or another M5 platform is the correct fit.
- Analog phones, fax, modem or legacy endpoints
- Cloud PBX, SIP carrier, IP-PBX or Teams architecture
- Fax, DTMF, routing and codec requirements
- Provisioning, security and multi-site management
- 4102S vs C7, G7 or Sentinel 400 selection