2-Wire Analog and 4-Wire E&M Network Testing

07th, Aug 2026

Analog communication systems remain critical across enterprise, carrier, public safety, transportation, utility and industrial networks. As these environments continue to evolve, organizations require efficient and repeatable methods to validate call processing, signaling interoperability, voice quality and overall service performance.

Manual testing can be time-consuming and difficult to scale, particularly when validating multiple analog interfaces, signaling scenarios, Interactive Voice Response applications, fax services, and regression test cases. Organizations require automation to improve test coverage, reduce validation time and accelerate product qualification.

To address these challenges, GL Communications' Message Automation & Protocol Simulation (MAPS™) Analog Phone Simulator provides a versatile automation platform for bulk call generation and testing of 2-wire Analog (FXO/FXS) and 4-wire E&M communication networks. The platform emulates analog endpoints, generates realistic bulk call traffic, and automates end-to-end validation of analog telephony services through script-driven testing, signaling verification, voice quality assessment, IVR and fax testing and centralized reporting.

MAPS™ APS

Automate Analog Network Testing

MAPS™ Analog Phone Simulator automates the complete analog call lifecycle using flexible, programmable scripts. The platform verifies call establishment, answer supervision, disconnect, hook flash, caller ID, DTMF transmission and detection, fax communication, supplementary services, and long-duration call scenarios. Automated execution improves testing consistency, expands validation coverage and significantly reduces validation time.


Generate Realistic Bulk Call Traffic and Validate Signaling

The platform generates large volumes of realistic analog call traffic to evaluate communication systems under operational conditions. Support for Loop Start, Ground Start, and 4-wire E&M Types I, II, III, IV, and V, together with Immediate Start, Wink Start, and Delay Dial supervision, enables comprehensive interoperability testing across PBXs, Central Offices, gateways, channel banks, and legacy telephony equipment. These capabilities help verify signaling compatibility and overall network behavior before deployment.


Verify Voice Quality and Telephony Services

Beyond functional testing, MAPS™ Analog Phone Simulator supports optional Voice Quality Testing using POLQA®, PESQ, and E-Model MOS algorithms to objectively evaluate speech quality. It also performs comprehensive voiceband measurements, including 1004 Hz Net Loss, Twenty-Three Tone, Signal-to-Noise Ratio and Level, Gain Slope (Three-Tone Slope), Attenuation Distortion, Intermodulation Distortion (IMD), and Impulse Noise tests, helping engineers quickly identify transmission impairments before deployment.

The platform also automates testing of Interactive Voice Response (IVR) applications, voicemail systems, fax services, caller ID, regional tones, DTMF recognition, fax services, IVR applications, voicemail systems, and supplementary telephony services. Integrated Speech Transcription Server enables automated IVR traversal by recognizing voice prompts and validating customer interactions without manual intervention.


Accelerate Regression and Interoperability Testing

MAPS™ Analog Phone Simulator supports repeatable functional, interoperability, regression, stress and long-duration testing through script-driven automation, independent line control, and concurrent multi-user operation. Support for Python and Java APIs enables seamless integration with existing automation frameworks, helping organizations accelerate product qualification while reducing overall testing effort.


Why Choose MAPS™ Analog Phone Simulator?

MAPS™ Analog Phone Simulator provides a scalable and repeatable approach to analog telephony testing, enabling organizations to validate new equipment, verify software releases, and qualify network upgrades with confidence.

  • Reduces manual testing through automated bulk call generation and programmable test execution
  • Comprehensive testing of 2-wire Analog (FXO/FXS) and 4-wire E&M communication networks
  • Analog signaling validation, including Loop Start, Ground Start, and E&M Types I–V
  • Supports up to 96 independent FXO or FXS subscriber ports per system
  • Complete solution with server hardware, GL MAPS™ software, channel banks, and optional fax and voice quality analysis modules
  • Supports Python and Java APIs for seamless integration with automation frameworks
  • Optional POLQA®, PESQ, and E-Model MOS voice quality assessment with comprehensive voiceband measurements
  • Concurrent multi-user operation with centralized reporting with pass/fail results, detailed diagnostics, and delay metrics
  • Supports call monitoring and call recording for enhanced test analysis, troubleshooting and validation

Applications

  • Enterprise PBX validation
  • Central Office and PSTN testing
  • Analog Telephone Adapter qualification
  • Analog gateway interoperability testing
  • 2-wire Analog (FXO/FXS) interface validation
  • 4-wire E&M trunk testing
  • Interactive Voice Response testing
  • Fax interoperability testing
  • Telecom software regression testing
  • Carrier acceptance and interoperability testing

Whether developing next-generation telecom equipment, modernizing legacy analog infrastructure, or automating large-scale interoperability testing, MAPS™ Analog Phone Simulator provides a scalable platform that simplifies testing, accelerates product qualification, and improves confidence in network readiness.


Why GL Communications?

  • 40+ years of expertise in network testing solutions
  • Comprehensive telecom protocol emulation and automated test solutions for analog, TDM, VoIP, wireless, and IP network validation
  • Support for enterprise, telecom, cloud, data center, 5G and defense networks
  • Comprehensive portfolio of packet capture, packet analysis, traffic generation and network monitoring solutions
  • Deep protocol expertise with support for hundreds of telecom and IP protocols
  • Scalable solutions designed for laboratories, field deployments and Network Operations Centers
  • Continuous innovation focused on simplifying network visibility, accelerating troubleshooting and helping organizations maintain reliable high-performance networks

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