GL Communications Inc.

IP / VoIP Analysis & Simulation


VoIP Call Generation & Analysis (Product Of The Year Award 2004)

IP/VoIP Protocol Simulators

Signalling and Traffic Simulator - MAPS™

GL's Message Automation & Protocol Simulation (MAPS™) is a protocol simulation and conformance test tool that can be applied to a variety of protocols such as MGCP, SIP, MEGACO, SS7, SIGTRAN, ISDN, GSM, and others.
Almost all MAPS™ IP based simulation products supports FAX over IP (FoIP) simulation supporting both the types- RTP G.711 Pass Through Fax Simulation (PKS200) and T.38 Fax Simulation over UDPTL (PKS211).

MAPS™ SIP IMS test suite provides an advanced full-fledged network environment that enables user to test their applications, devices, and services prior to deployment on a real-time network. With the help of mobile phones, and other simulated wireless networks, the VoLTE Lab setup can be operated in real-time for making VoLTE calls and also for interworking with PSTN and VoIP networks.

Test Solutions for Air Traffic Managament - MAPS™

VoIP ATM Radio Simulator

MAPS™ ED-137 Radio simulator software simulates Air-to-Ground calls per EUROCAE standards (ED-137/1C, ED137/1B) to perform functionality and performance testing of network elements within VoIP ATM core network. The simulator software provides ability to customize the call parameters for simulating different call scenarios between Controller Working Positions (CWPs), Ground Radio Station (GRS) or Radio Media Gateways (RMG). Hundreds of CWPs/Radios can be simulated to perform functionality and load testing of the ATM network. All capabilities of the simulator will be demonstrated at our booth. Please feel free to visit us at booth #1367 or email us if you have specific queries.

VoIP ATM Controller Simulator

MAPS™ ED-137 Telephone simulator software simulates bulk Ground -to-Ground calls per EUROCAE standards (ED-137/2B). The simulator software provides ability to customize the call parameters for testing different call scenarios between Controller Working Positions (CWPs) across VoIP ATM network. Hundreds of CWPs can be simulated. Supported call types include- Instantaneous Access (IA), Priority Direct/Indirect Access (DA/IDA), Routine Tactical Direct/Indirect Access, Routine Strategic Direct/Indirect Access, Routine General Purpose Direct/Indirect Access, Position Monitoring Call (Combined A/G and G/G, A/G only, and G/G only). All capabilities of the simulator will be demonstrated at our booth. Please feel free to visit us at booth #1367 or email us if you have specific queries.


TDM / VoIP Gateway Tester

MAPS is an ideal tool to evaluate Gateway / ATA with TDM and VoIP Interfaces. The tester supports T1 E1 PRI ISDN, Megaco, and SIP interfaces. Product features include call connectivity, call signaling, traffic generation, voice quality testing, codec, and hundreds of other features. For more details, contact GL Communications.

Other notable features include -

  • Interfaces to Portable T1E1, and VoIP
  • Support for SIP protocol conformance testing
  • Test Echo canceller performance and compliance
  • Multi-protocol call trace for TDM / VoIP

Bulk Call Generator - MAPS™ HD

MAPS™ HD is a High Density version of MAPS™ and a special purpose 1U network appliance that is capable high call intensity (hundreds of calls/sec) and high volume of sustained calls (tens of thousands of simultaneous calls/1U platform). MAPS™ HD network appliance is designed to easily achieve 4 to 20,000 endpoints per 1U server. Using a stack of multiple servers, a larger test system with 100K-200K calls (all controlled from a single Master Controller) is achievable for enterprise to carrier grade testing.

The network appliance performs signalling and traffic generation for a vast array of communication protocols covering IP and Wireless networks. It supports simulation of SIP UA, IMS SIP UE, SIP I+T, SIGTRAN, IuCS, MGCP, NCS, H.248/Megaco, Cisco SCCP (Skinny), Clear Channel (No Call Control) and provides non-reference-based voice quality using E-model (R-factor) and MOS with five mapping scales.



PacketGen™ is a PC-based real-time VoIP bulk call generator for stress testing and precise analysis of the VoIP network equipment. PacketGen™ is based on a distributed architecture, wherein SIP and RTP software cores can be modularly stacked in one or many PCs to create a scalable high capacity test system. An optional hardware RTP can support 120 real-time voice calls from real phones, or fax calls from fax machines.

Some of the prominent features of PacketGen™ are listed below,

  • Distributed architecture for GUI, SIP and RTP systems provides high call rates and media streams. This also makes it scalable & easy to add additional load generation capacity.
  • Generates both SIP signaling & RTP traffic (voice, fax, digits, tones)
  • Full SIP Functionality - Registration, Call Forwarding, Call Hold, Call Transfer, Authentication, etc.
  • Manual and Bulk Calling capabilities with complete flexibility on each call session

RTP ToolBox™

GL's RTP ToolBox™ testing and simulation tool is designed not only to monitor RTP and RTCP packets, but also to allow users to manually create and terminate RTP sessions, independent of call-signaling protocols such as SIP, H323, MEGACO, or MGCP. 

Some of the prominent features of RTP ToolBox™ are listed below,

  • Testing and developing enhanced voice features (VAD, Echo Cancellation, Codec, Digit Regeneration, Digit Generation, Jitter Implementation and more) within end-user equipment (IP Phones, ATA, MTA and more).
  • Testing media gateway telephony interfaces.
  • End-to-End network testing before and during VoIP deployment.
  • Automated testing of Digital Signal Processing embedded into network elements.

RTP Traffic Generator

GL’s RTP Core allows creating, managing and deleting RTP sessions. RTP Core is a standalone application that acts as an interface between RTP Dll and the application. RTP Dll uses RTP protocol to carry the media streams including real-time audio, voice files, DTMF/MF digits, tones, IVR, FAX, impairments, and loopback traffic over created sessions. RTCP is used to monitor transmission statistics and quality of service (QoS). Different RTCP packets are also generated at random intervals carrying all control information about the session. 

With additional licenses, RTP Traffic Generator can support RTP traffic implementation over Iu-UP (Iu User Plane Interface) layer of the UMTS IuCs Network and also support RTP traffic as per ED-137B of EUROCAE standards used for voice communication in Air Traffic Control networks.

Bulk Traffic Generation -

  • RTP core can simulate bulk voice traffic using pre-recorded Voice Files in wave, pcm, and GL's proprietary pre-compressed GLW files with a synchronous Tx/Rx option over IP networks.
  • Bulk Video Call Simulation capability, possible to generate more than 500 simultaneous video calls using its pre-recorded video traces supporting codecs like H.264, H.263 etc.
  • RTP Fax Simulator is capable of bulk fax calls over IP in T.38 pass through mode (using G.711 PCMU and PCMA). It can transmit pre-recorded Tiff image to DUT (Real-time Fax machine), receive Pass-Through fax from DUT.
  • High Volume Mobile Data Traffic Generation - GTP Traffic Simulation modules within MAPS™ supports user-plane traffic simulation in LTE, UMTS, and GPRS networks. GTP, or GPRS Tunnelling Protocol are the methods for sending IP traffic in Wireless Networks such as GPRS, UMTS, and LTE.

Complete Voice, Video, and Data Quality Testing over Wireless and IP Network

GL’s mobile test solution provides the capability of connecting to and between any network, any service, and any interface for testing voice and data quality. Various associated applications (Voice Quality, Video Quality, Data tests, Echo and Delay tests, Fax tests, VBA) works with VQuad™to provide "end-to-end assessment" with additional test and measuring capabilities. Perform automated tests including TCP, UDP, HTTP, VoIP, Route, FTP, DNS, SMS, Email, PhoneInfo, SimInfo, and UEInfo tests. Typical networks supported includes Wireless (WiFi, Bluetooth®, 3G, 4G, LTE), Broadband Internet (3G, 4G), VoIP SIP, PSTN, and TDM.

GL’s VQuad™or GLNetTestapp on mobile devices initiate, control, and perform the entire video conferencing testing with the support of a Video Controller/Server and Video Clients (Agents). The Smartphones (Android) and PCs (both Windows and Linux supported) become the video clients or end points

Testing EC on VoIP ATAs and Gateways

GL provides several tools to thoroughly test VoiP ATAs - PacketGen, PacketScan, RTP Toolbox are some of the tools. The analog telephone adapter (ATA) permits consumers to easily utilize the broadband services for VoIP with a conventional landline. It has lot of advantages as it preserves the existing infrastructure (phones, wiring, jacks etc). These ATA's are totaly inexpensive and portable and also they provide very easy number mobility.


G.168 EC Compliance Testing for VoIP Network Elements

GL has developed two powerful tools to characterize echo, noise, and speech characteristics of voice connections. These tools are applicable whether the underlying network technology is PSTN, VoIP, ATM, Wireless, or Satellite. Typical problems that are easily diagnosed are:

  • Echo path delays exceeding the EC's delay limit, click here for a diagram
  • Impulse response dispersion spans across EC's limit
  • NLP is turned off causing residual echo to be heard
  • Impulse response has unusual multipath components that the EC is unable to converge on

Following are the various solutions offered for performing EC testing on VoIP networks. Click on each solution for more details


Voice Quality Testing on VoIP ATAs

The VoIP phones and ATA's must be free of noise and other hindrances that may cause a degraded voice quality when using this equipment. GL's VQuad™ w/ FXO Analog option and/or VoIP option, along with Voice Quality Testing (VQT), provides the complete automated network testing solution including four analog 2-wire interfaces (RJ-11), up to eight SIP User Agents and the voice quality measurement and analysis tools.


IP SoftPhone Testing

Providing clear, uninterrupted voice is critical in Network and Echo Cancellation development. GL's Voice Quality Testing (VQT), accessed through an easy to use GUI interface, along with the many supported platforms for transporting voice, provides the voice quality measurement and analysis tools for all types of networks carrying voice traffic.


VoIP Network Testing w/ GL's Media Gateway

The DCOSS MG (Media Gateway) system supports dual redundant Ethernet trunks for traffic and signaling testing of VoIP and IP networks. The DCOSS / MG combination provides user friendly bulk call generation and reception for various voiceband traffic types including voice, fax, and modem. It can be connected to any IP Phone, softphone, VoIP PBX, or VoIP Network / Cloud.


Ethernet/IP Testers

HD PacketExpert™ - Multi Port GigE Ethernet/IP Tester

  • HD-PacketExpert™ offers higher densities of 12/24 GigE ports form factor solution for testing GigE switches, routers and network conditions. This multi-device hardware unit incorporates all the features of a single PacketExpert™ (PXE100, or PXG100) unit along with the necessary PC hardware with Windows® OS and remote accessibility via Ethernet Remote Desktop.

PacketExpert™ - Ethernet/IP Tester


  • PacketExpert™1G (PXE100) is a Portable Quad Port Ethernet Tester (USB based) with 4 electrical 10/100/1000 Ethernet ports and 2 Optical Ports. The portable Ethernet/IP tester connects to Notebook PC through a USB 2.0 interface.

  • PacketExpert™ 10G (PXG100) product that provides comprehensive testing of 10G Ethernet/IP networks. It has two 10G optical ports, capable of BERT, Loopback and RFC 2544 test functionalities. Other additional functionalities includes -ExpertSAM, IPLinkSim, Record/Playback, and PacketBroker. The hardware interface also includes two 10/100/1000Mbps Electrical / Optical ports, supporting functionalities similar to the PacketExpert™ (PXE100).

  • Touchscreen Handheld PacketExpert™ 10G version of 10G Ethernet/IP Tester (PXG101), with a Tablet PC mounted on PacketExpert™ 10G, which makes this tester suitable for field testing.
Each GigE port provides independent Ethernet/VLAN/MPLS/IP/UDP testing at wire speed for applications such as BERT, RFC 2544, and Loopback. BERT is implemented for all layers (as depicted below). RFC 2544 is applicable for Layers 2, 2.5, and 3, and Loopback is applicable for Layers 2, 3, and 4.


GL’s PacketExpert™, a quad port Ethernet / IP Tester includes an optional ExpertSAM™ application intended for multiservice testing to measure the maximum performance of the Device or the Network Under Test. ExpertSAM™ is a set of procedures that test the ability of Ethernet-based services to carry a variety of traffic (voice, data, and video) at defined performance levels. In particular, it is aimed at addressing limitations of legacy RFC 2544 test procedures, especially for Service Level Agreements (SLA).

ExpertSAM™ is a single test conducted to validate SLAs as per ITU-T Y.1564 standard. The ITU-T Y.1564 is built around two key subtests, the Service Configuration Test and the Service Performance Test.


Wirespeed Packet Capture and Playback

Record and Playback is an optional application within PacketExpert™, which is used to transmit and / or capture packets at wirespeed over network.  Record and Playback feature is available in various operating modes such as Record Only mode, Playback Only mode, Record and Playback mode, and Record and Playback (per port) mode.


PacketBroker™ – Wirespeed Ethernet Tap

PacketBroker™ is an optional application added to GL’s PacketExpert™ platforms that allows the Ethernet test tool to be used as a highly precise non-intrusive Wirespeed Ethernet Tap with all the necessary features such as Pass through TapHardware Filtering, Packet Modification and Output aggregation.


PacketCheck™ - Software Ethernet Tester

GL's PacketCheck™ is a PC based Ethernet test tool that is designed to check frame transport ability, and throughput parameters of Ethernet and IP networks.

It can be used as a general purpose Ethernet performance analysis for 10Mbps, 100Mbps and 1Gbps Ethernet local area networks. The PacketCheck™ makes use of the network interface card (NIC) in the PC to transmit and receive Ethernet packets over the network. Throughput up to 800 Mbps can be easily tested.


IP/VoIP Protocol Analyzers

PacketScan™ - All-IP Signalling and Traffic Analysis Tool

PacketScan™ (PKV100) - an All-IP Network Monitoring software offers powerful features to capture and monitor live signaling and traffic over IP (version 4 and 6). It captures, segregates, monitors and collects statistics on all IP calls.Supports decoding of almost all industry standard signaling protocols – See Protocol List for more details.

Some of the prominent features of PacketScan™ are listed below,

  • Users can perform a host of activities on the captured calls, allowing you to get an exact picture of QOS (quality of the service) and the technical adherence (adherence to the protocols specified by the standardizing authority) of the system under test.
  • It allows users to listen/record VoIP calls in real-time; perform power, frequency, spectral, tone and digit analysis with ease and precision.
  • It's ability to monitor / record audio and video data of a session to files (in QuickTime *.qt format), allows users to perform powerful video analysis.
  • The captured VoIP calls with video can be played back using 3rd party VLC Viewer application.
  • Detailed call statistics such as packet loss, gap, jitter, delay, RTP performance statistics, and unparalleled voice band statistics can be monitored simultaneously.

GL also provides PacketScan™ HD (PKV120) for High Density IP Traffic Analysis w/ 4x1GigE Network Monitoring and PacketScan™ FB (PKV121), a File Based IP Traffic Analyzer Server for near real-time processing of traces.


Packet Data Analysis

Packet Data Analysis (PDA) is an outstanding tool for live monitoring of signaling and traffic over IP. Packet Data Analysis (PDA) is distributed with GL’s Packet Analyzers, allowing users to monitor live IP networks including capture, analysis, and reporting of every call in detail. Supported protocols include SIP, MEGACO, MGCP, H.323, SCCP, RANAP (UMTS IuCS), and GSM A. It can capture IP packets over different transmission lines, including IP, T1, E1, T3, E3, and OC-3 STM-1 / OC-12 STM-4. PDA then processes the captured packets, identifies, and segregates calls based on signaling and traffic parameters.



NetSurveyorWeb™ remotely works with PacketScan™, a central web server and database to facilitate result display using web based clients. Users can view real-time data, navigate through records, filter the collected VoIP traffic summary, and graphically analyze the call volume, MOS, call completion, failed calls, completed calls, PDD, and more through a simple web browser.


PacketProbe™ - An Embedded VoIP Monitoring Solution

GL's PacketProbe™ is an advanced embedded VoIP monitoring software. The PacketProbe™ passively monitors VoIP traffic carried over LAN or WAN by producing real-time per call and per-stream voice quality metrics. Call Detailed Records (CDR) along with voice quality including Mean Opinion Score (MOS) and other vital diagnostic information provide network managers immediate visibility into service quality, call volume, and call details. Service providers should be able to rapidly drill down and diagnose voice quality problems. PacketProbe™ software can be used as an embedded application or as standalone probe appliance. Multiple PacketProbes™ can provide network wide voice quality visibility through GL’s NetSurveyorWeb™ or other NMS systems.


Near Real-time Voice-band Analyzer

The Near Real-time Voice-band Analyzer (VBA) is an analysis tool for monitoring voice band network traffic. The VBA can host different analysis modules for monitoring speech and noise levels, and line echo. The standard modules included in the application are ITU-T P.56 Active Voice Level analysis, Line Echo (Hybrid) analysis, and Acoustic Echo analysis. Other analysis modules such as ITU-T P.561, P.562, and P.563 can be hosted as plug-ins.


IP Fax and Modem Analysis

GLInsight™ with FAX for IP is a powerful and feature rich offline software tool that analyzes pre-recorded IP fax calls. GLInsight™ with MODEM for IP analyzes modem traffic recordings within IP packets, by depacketization of the PCM signal, appropriate signal analysis, demodulation, phase analysis, error correction and data decompression.


IP WAN Emulators

IPNetSim™ - Multi-Stream IP WAN Simulator

IPNetSim™ emulates an IP network with access to 10 Gbps full duplex link or a 10/100/1000 Mbps full duplex link. For each direction, incoming traffic can be identified into separate user defined streams (up to 16 streams for 1 Gbps pipe and up to 4 streams for 10 Gbps pipe). These user defined streams can be modified to simulate network impairments. All the conditions encountered in a real-time IP network are simulated such as network latency, network delay variation (jitter), bandwidth, congestion, packet reordering, packet duplication, packet errors, bit errors and other link impairments independently in both directions at speeds of up to 1000 Mbps and up to 10Gbps links . It can be used to test IP end point devices such as (Gateways, IADs, IP phones, Soft phones, and so on) for voice, fax, data, or multimedia transmission over IP.

GL offers various platforms supporting IPNetSim™ –

  • IPNetSim™ 1G/10G 1U Rack option
  • IPNetSim™ 1G/10G Portable Hardware Unit

IPNetSim™ Handheld - Ethernet, IP, WAN Network Emulator

GL's IPNetSim™ Handheld is a hand-held battery operated instrument that can simulate the real-time IP and Carrier Ethernet network dynamics by means of hardware controlled packet delay, loss, jitter, errors, bandwidth limitations, congestion, and duplication. IPNetSim™ Handheld offers to manage network behaviours of up to 1 Gbps rates with accuracy always better than 1ms. IPNetSim™ Handheld is equipped with hardware based impairments generator, and dual GbE ports.


IPLinkSim™ - IP WAN Link Emulator

The IPLinkSim™ - IPN511 is available as 1U rackmount hardware unit, which incorporates all features of WAN Link Emulator for 1 Gbps and 10 Gbps network along with necessary PC hardware, Windows® OS and remote accessibility via Ethernet Remote Desktop.The hardware unit includes 2 x (10/100/1000 Mbps) Electrical or (1000 Mbps) Optical ports supporting IP WAN up to 1 Gbps, and 2 x 10 Gbps Optical only ports. The IPLinkSim™ can simulate a single bi-directional link between any two active ports.

WAN Link Emulation is provided essentially by bandwidth control within IPLinkSim™, which mimics slower WAN links like RS232/DSL/Modem/T1/E1/T3/E3 etc. IPLinkSim™ can be used to test performance of applications that uses Ethernet /IP based transport such as Web Services, Email, FTP, Database access, enterprise networks, storage, cloud services, VoIP services, audio/video streaming and so on.


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