USR® Courier® Modemulator™ & 3G M2M Cellular Gateway

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The exclusive USRobotics Modemulator & M2M Cellular Gateway provides a simple drop-in cellular replacement for legacy dial-up or leased line analog systems that require peer-to-peer connectivity.

Modemulator cellular and analog connections

The new USRobotics® Courier® Modemulator™ and Cellular M2M Gateway is a drop-in cellular replacement for legacy analog systems that require peer-to-peer connectivity†. Emulating a dial-up modem allows equipment to seamlessly connect over a cellular network instead of over the PSTN in legacy M2M applications. Existing legacy hardware and software systems remain untouched when used with the Modemulator — providing extended product life and simplified cellular deployments. Compatibility with both the PSTN and packet switched data networks provides network flexibility that allows an open ended transition plan and eliminates the need for a system overhaul — saving both time and money. By providing a 2-in-1 device, analog customers can transition select sites to cellular in the most efficient and cost-effective way while utilizing the network that is right for the situation. USR's Modemulator & Cellular Gateway provides reliable, secure connections for mission critical M2M applications.

The gateway provides LAN to WWAN routing and GPS functionality in a single device certified on all major 3G cellular networks (CDMA/EVDO and WCDMA/HSPA+). An embedded serial port allows quick implementation for a wide variety of serial based systems already out in the field making it ideal for M2M Serial applications including remote maintenance and control, Point of Sale, monitoring, and automation. The Courier Cellular Gateway is simple to configure locally or remotely from your PC, tablet or smartphone with the cloud based management system allowing fast implementation — reducing customer costs significantly and lowering the entry barriers to a wide range of M2M solutions and an easier transition from analog to cellular. USRobotics' Courier Modemulator & M2M Cellular Gateways continue to offer reliable, secure connections for mission critical applications — for both GSM and CDMA networks allowing more flexible and cost-effective global solutions.

Modemulator Features

Multiple Modes

  • Peer-to-Peer mode† provides true drop-in replacement
  • Single ended mode for connecting with traditional TCP Client or Server
  • Bypass mode for serial gateway operation
  • Send commands to the remote Modemulator with remote command mode

Simplified Conversion

  • No need to install middleware or upgrade legacy communications software that expects analog modem & PSTN
  • With an optional serial modem, initiate and answer connections over the PSTN to sites with analog modems
  • Support for a "mixed network" of both analog and cellular devices allows gradual modem replacement
  • Unified interface and protocol for connecting both cellular and analog sites
  • Continue to use the USR M2M Cellular Gateway after transition complete

Modem Emulation

  • Compatible with common Hayes modem AT commands
  • Generates modem result codes including RING, RINGING, CONNECT, NO CARRIER, NO DIALTONE, and BUSY
  • Outbound and inbound calling
  • Supports baud rates from 300 to 115.2k bps
  • Peer-to-peer connections
  • Stores up to 7,200 phone numbers/IP addresses
  • Direct IP dialing
  • Emulate leased line operation‡
  • RS-232 break signal handling‡


  • Cellular Gateway features include:
  • 3G UMTS or CDMA2000/UMTS *
  • 2G GSM or CDMA/GSM *
  • Configure locally with intuitive embedded GUI
  • Manage remote device's software and configuration with USR Universe - a free cloud application
  • Secured internal SIM slot
  • Persistent connectivity and auto reboot and recovery

Security & Reliability

  • Required private cellular network ensures continued secure connections
  • Login banner and security warning banner
  • Prompted password access
  • Caller ID screening
  • Dialback security‡

Easy Setup

  • Fast implementation and deployment in analog based solutions
  • Easy configuration using familiar AT commands in the CLI

Advanced Features

  • Auto-switchover to an attached dial-up modem for PSTN connections

Gateway Features

M2M Partnerships for a Complete Solution§

  • Access to MVNOs with no volume restrictions offering worldwide SIMs and data plans
  • Dedicated Sales and Engineering staff available to help plan M2M solutions
  • Simple and easy all-in-one billing for worldwide accounts
  • Reduce costs with data pooling
  • User-to-modem connections with static IP addressing
  • Remote diagnostics for both the modem and the service

Courier Brand

  • Reliable modems trusted by IT admins for over 30 years
  • Business class, rock solid quality you can depend on for mission critical applications

Security & Reliability

  • Encrypted cellular connections when combined with a network operator's secure tunnel prevent eavesdropping and block unauthorized access§
  • All software and configuration images are protected with digital signatures with rollback safety
  • Built in software and hardware watchdogs monitor the device automatically resolving common problems including persistent connectivity and automatic reboot ideal for remote management solutions
  • Certificate and password based security mechanisms protect all management functions; all management actions use hardware assisted encrypted links
  • Wired LAN connectivity facilitates compliance with strict medical safety requirements

Easy Configuration and Management

  • User friendly GUI for configuring SIMs, firewalls, and port filtering
  • Change network carriers in less than a minute
  • Wirelessly upgrade firmware and duplicate configurations with the free cloud based USR Universe

Industrial Quality Design

  • Compact design ideal for branch offices with small IT closets or small off-site locations in need of remote management
  • Rugged aluminum housing for use in harsh conditions
  • Concealed SIM slot discourages unauthorized removal of SIM
  • Versatile mounting options to increase stability and security

Cellular Networks

  • CDMA 1xRTT/EV-DO (USR3520)
  • AWS Band

Regulatory Approvals

  • PTCRB (USR3520)
  • GCF compliant (USR803520)
  • FCC, IC (USR3520)
  • CE, R&TTE (USR803520)

Multiple interfaces

  • RS-232 (DB9) Serial interface for easy communication with console ports, ATMs, digital signage, and meters
  • 10/100 RJ45 Ethernet to connect to LANs, ATMs, and POS systems

Embedded GPS

  • Asset Tracking capability

Advanced Features

  • Web based remote configuration capability via dynamic DNS or static IP
  • Embedded modem emulation

* Dual radio is not available on USR803520.
† Wireless Master Service, peer-to-peer routing, or device-to-device routing service is required for the peer-to-peer functionality.
§ MVNO services may require a subscription for qualified customers. New SIM activation may be limited on 3G networks.
**All measurements at 12V DC
‡ Features available on firmware version 1.0.02 and higher. Available for download at


Courier® Modemulator™ & 3G M2M Cellular Gateway
Order Now

MSRP € ex Vat:

Product Code : USR803520

Custom Orders Only, Contact us for SIMs and Data Rate Plans

Approved for EU

Additional Availability

US & Canada- Not Available
Middle East and Africa- Not Available
Asia Pacific- Not Available
Latin America- Not Available

Contact Us

  • Phone (UK):
    +44 (0)808 234 5935