GL Communications Inc.

IP and VoIP Analysis and Simulation



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

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pdf PacketScan™ Brochure
pdf IPNetSim™ Brochure

IP/VoIP Protocol Simulators WAN Emulators IP/VoIP Protocol Analyzers


  Download Whitepaper on "Testing ATAs, Gateways, VoIP PBXs, and other Signal Processing Elements in VoIP Networks"

WAN Emulation

PacketBroker - Wirespeed Ethernet Tap

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

IPNetSim™ - IP Network Simulator

IPNetSim™ can simulate an entire IP network in a single box. All the conditions encountered in a real-time IP network are simulated such as network latency, network delay variation (jitter), bandwidth, congestion, packet errors, bit errors and other link impairments independently in both directions at speeds of up to 100 Mbps (or1Gbps per link). 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.

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.

PacketShark™ - GbE Packet Capture, Filter & Aggregation Tap

GL's PacketShark™ is a handheld hardware that can tap packet networks, capture Ethernet packets at wire speed, i.e., in optical or electrical interfaces up to 1 Gb/s and selectively filter the captured traffic based on specified criteria. Packets are transmitted through two ports and the packets that are traffic compliant with one of the filters is sent to a packet analyzer, such as GL's PacketScan™ for detail packet analysis. Alternatively, the traffic can be even sent to a memory card (SD) and later analyzed offline.

PacketExpert™ - Quad Port Ethernet/IP Tester  

GL's PacketExpert™ 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.

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.

PacketExpert™ - with IPLinkSim™

IPLinkSim™ is an optional application with portable hardware based PacketExpert™- Ethernet / IP Tester. IPLinkSim™ simulates IP WAN (Wide Area Network) links. 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. This feature allows testing applications running in PCs which normally have 100/1000 Mbps interface but access to the outside internet or intranet over WAN is very slow. 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.

PacketExpert™ - ExpertSAM™   

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.

PacketExpert™ - 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.

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.

Message Automation & Protocol Simulation (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.

This message automation tool covers solutions for both protocol simulation and protocol analysis. The application includes various test plans and test cases to support the testing of a required real-time scenario.

Along with automation capability, the application gives users the unlimited ability to edit messages and control scenarios (message sequences). "Message sequences" are generated through scripts.


  • Provides fault insertion, and erroneous call flows testing capability
  • Functional testing, Regression testing and Conformance testing of network elements
  • Ready scripts makes testing procedure simpler, less time consuming and hence time to market products

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

PacketScan™ - SIP / H323 / Megaco / MGCP / RTP / RTCP / Video Analysis

PacketScan™ - 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.

High Density Call Generator for IP Networks

GL offers the following SIP/RTP bulk call generators:

MAPS™ HD (High Density) 

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 stand alone 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, 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. 

Complete Voice 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. The application allows end-to-end intrusive testing for voice, data and video quality, echo, noise, call failure rates, and other impairments between and within different networks. 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.

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.

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 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.

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.

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.

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