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Traffic Simulation across IP, Analog, TDM, and Wireless Networks with MAPS™


As traffic intensity increases, network elements (including switches and transmission) can impart various impairments such as errors, excessive delay, congestion, blocking, loss, and degraded quality. Simulating traffic can be valuable to characterize the impairment as a function of traffic intensity and traffic types (e.g. Voice, Fax, Data, & Video).

Message Automation and Protocol Simulation (MAPS™) is a multi-protocol, multi-technology platform used for signaling and traffic generation for a vast array of communication protocols covering IP, Analog, TDM, and Wireless networks. MAPS™ can be used to test legacy networks (which use conventional signaling such as CAS, SS7, ISDN, PPP,…), newer generation IP networks (such as SIP, MGCP, MEGACO, SIGTRAN, Diameter…), and also the Wireless networks (which use GSM, UMTS, LTE and Diameter signalling).

With MAPS™ Client-Server application, MAPS™ supports a Command Line Interface (CLI) such as the TCL, Python, VBScript, Java, and .Net scripting tools, to provide the capability of remote operation, automation, and multi-site connectivity.  User can remotely perform all functions such as start testbed setup, load scripts and profiles, apply user events such as send digits/file/tones, detect digits/file/tones, dial, originate call, terminate call, start and stop traffic and so on.

GL’s MAPS™ HD is a High Density 1U network appliance that is capable of high call intensity (hundreds of calls/sec) and high volume of sustained calls (tens of thousands of simultaneous calls/1U platform) for a vast array of communication protocols covering IP and Wireless networks. MAPS™ HD network appliance is designed to easily achieve up to 20,000 endpoints per appliance (5000 per port). This requires GL’s RTP HD traffic generation capability (PKS109) and specialized 1U rack system with integrated HD NIC ( w/ 4x 1 GigE. Or 2x 10 GigE).

For more details, visit Signaling and Traffic Simulator webpage.

  Traffic Type License

GTP Mobile Traffic Simulation
Generate and verify user mobile data (Email, Web-HTTP, and FTP), gateway traffic, and packet traffic over (GTPv1 and GTPv2) GPRS Gb, UMTS (GnGp, IuPS), and LTE (S1, eGTP) network interfaces

  • Stateless simulation of HDL Files, Hex string, and BER patterns,


  • GTP Mobile Traffic Core – Stateful HTTP traffic simulation
  • Simultaneous simulation of multiple GTP sessions per user


  • PacketLoad (HD GTP Mobile Traffic Core)- Stateful high density packet traffic generation
  • TCP/HTTP, UDP, and PCAP Replay

(requires optional license-contact GL)

  • Mobile Traffic Core – Gateway


  • Mobile Traffic Simulation - GPRS Gb


RTP Traffic Simulation 
over SIP, SIP I, MGCP, MEGACO, UMTS, GSM, Diameter, and LTE networks 

  • Create, manage RTP sessions and generate and receive RTP traffic over the sessions with complete automation capability
  • Simulation of RTP Traffic such as Voice, Digits, Tones, IVR and Impairments
  • Automate the IVR testing process (call establishment and traffic generation / detection) process through scripts

All Voice Codecs supported including –

    • G711 µ-law and A-law with VAD
    • GSM-FR, HR, EFR
    • G729A, G729B, G722, G722.1
    • G726 (40K, 32K, 24K, 16K) with VAD
    • AMR (codec rates-4.75, 5.15, 5.9, 6.7, 7.4, 7.95, 10.2, 12.2) with VAD (requires additional licenses)
    • AMR-WB (Codec rates-6.60 kbps, 8.85 kbps, 12.65 kbps, 14.25 kbps, 15.85 kbps, 18.25 kbps, 19.85 kbps, 23.05 kbps, 23.85 kbps) with VAD (requires additional licenses)
    • EVRC, EVRCB, EVRC-C (requires additional licenses)





  • RTP Voice Quality Measurements – MOS, R-Factor scores



PKS200, and PKS211



SMS Traffic Simulation
over the GSM, UMTS, and MAP interfaces

  • Ability to push / pull Short Messages over the network as if sent by thousands of mobile phones (Short Message Mobile Originated (SMS-MO)). MAPS™ can also transmit a Short Message to a mobile phone (Short Message Mobile Terminated (SMS-MT)).


TDM Traffic Simulation
over ISDN, SS7, GSM, CAS interfaces

  • Simulation of TDM Traffic such as digits, voice file, single tone, dual tones, Dynamic VF





  • TRAU GSM traffic over GSM Abis interface
  • Create, monitor, and terminate TRAU GSM traffic sessions



Analog & TDM Traffic Simulation

With the purchase of additional license (xx610, xx620), MAPS™ supports transmission, detection and capture of various traffic such as, digits, voice files, single tones, dual tones, Dynamic VF, FAX, and IVR over established calls on TDM and Analog networks. The volume of calls can vary from few hundreds to thousands of calls depending on the T1 E1 or Analog platform of choice. 

These features are applicable for MAPS™ ISDN, MAPS™ SS7MAPS™ GSM AMAPS™ CAS, and MAPS™ FXO FXS applications only.

Fax Simulator (xxFT0) is capable of transmitting and receiving bulk fax over many T1 E1 timeslots or through two-wire FXO and FXS lines. The software can emulate many "virtual fax machines" - transmitter as well as receiver. All variations of T.30 fax protocol are supported such as page size, resolution, min & max data rate, and codec type – including high speed fax such as V.34. This application works with MAPS™ TDM products simulating complete real-time single and bulk (100's) fax calls.

TDM Traffic Events
For GSM, TRAU (Transcoder Rate Adapter Unit) traffic simulation (xx646) is included with options to create, monitor, and terminate TRAU GSM traffic sessions supporting transmit/receive DTMF digits, files, and tones over established GSM calls. TRAU traffic simulation is applicable for MAPS™ GSM Abis application only.

GSM SMS-MO/SMS-MT Procedure Events

MAPS™ also supports sending and receiving SMS (Short Message Service) using signaling channel simultaneously with other voice and data services over a GSM, UMTS, or MAP interfaces. MAPS™ has the ability to push / pull Short Messages over the network as if sent by thousands of mobile phones (Short Message Mobile Originated (SMS-MO)). MAPS™ can also transmit a Short Message to a mobile phone (Short Message Mobile Terminated (SMS-MT)). The short message service testing is available on the GSM, UMTS, and MAP interfaces. GL’s 2G, & 3G Wireless Lab setup supports end-to-end SMS calls simulation in Circuit Switch (CS) network.

This feature is supported in MAPS™ GSM A over IPMAPS™ MAPMAPS™ IuCS, and MAPS™ IuH applications.

RTP Traffic Simulation

With the purchase of RTP Core license (PKS102), MAPS™ supports transmission and detection of various RTP traffic such as, digits,  single tone, dual tones, FAX,  IVR, and voice. These features are available with  MAPS™ UMTS IuCS & IuH, MAPS™ GSM A over IP, MAPS™ GSM Abis over IP,  MAPS™ SIP, MAPS™ SIP I, MAPS™ MEGACO, MAPS™ MGCP applications only. With additional licenses, Video (PKS106) and Fax traffic can also be simulated over the established RTP sessions. Currently, RTP Video simulation is supported in MAPS™ SIP only. The RTP core also provides useful voice call quality metrics such as Listening and Conversational Quality MOS scores - MOS-LQ, MOS-CQ , and Listening and Conversational Quality R factors - R-LQ, R-CQ. Estimates are based on the ITU G.107 E Model. For more information, refer to RTP Traffic Generator webpage.

With GL’s RTP HD traffic generation capability (PKS109), MAPS™ can achieve high volume calls. This requires a specialized 1U rack system with integrated HD NIC ( w/ 4x 1 GigE. Or 2x 10 GigE). MAPS™ HD network appliance can easily achieve up to 20,000 endpoints per appliance (5000 per port).

Traffic actions include -

  • Create, manage RTP sessions and generate and receive RTP traffic over the sessions with complete automation capability
  • Transmit pre-recorded video traces with video codecs like H.264, H.263 etc. **
  • Transmit and receive pre-recorded voice files, and live voice
  • RTP based Voice Quality (MOS and R-Factor) measurement for the received streams
  • Customize codec options (payload type, ptime) over Tx/Rx sessions. All Voice Codecs are supported (Visit Voice Codecs webpage for more comprehensive information).
  • Talk using Microphone - allows the user to generate live voice
  • "Play to Speaker" streams voice to a speaker
  • Transmit and receive FAX files in T.30 pass-through mode.  Fax over UDPTL transport using T38 protocol (compliant with ITU-T T.38 (03/2002)) operates at the maximum of 33.6 kbps speed  **
  • Loopback real-time voice traffic (all received traffic is retransmitted as sent traffic)
  • Generation and Detection of RTP Events per RFC-2833 & RFC-4733 such as Answering Tone, Calling Tone, Special Dial Tone and other Call Progress Tones
  • Generation of user-configurable impairments over established RTP calls such as
    • Latency - Fixed, Uniform, and Normal Distributed
    • Packet Loss - periodic, random, and burst
    • Packet Effects - Out-of-order and Duplicate packets
  • Supports RTP traffic implementation over Iu-UP (Iu User Plane Interface) layer of the UMTS IuCs Network **
  • Supports RTP traffic as per ED-137B of EUROCAE standards used for voice communication in Air Traffic Control networks **
  • Calculates and provides RTP voice quality metrics such as Listening MOS, Conversational MOS, Jitter, delay, lost packets, duplicate packets, discarded packets, and out of order packets on each session**
  • Detailed statistical information of RTP and RTCP packets
  • Jitter Buffer implementation for the received traffic to give near real time affect
  • Supports High Density RTP Traffic Generation (requires PKS109 licenses)

** Some of these features requires additional licenses – Contact GL for more information

RTP Traffic Events
With additional RTP Voice Quality Measurements (PKS108) licenses RTP based Voice Quality (MOS and R-Factor) measurement are calculated and updated periodically for the received streams. Call quality metrics includes Listening MOS, Conversational MOS, PacketLoss, Discarded Packets, Out of Sequence Packets, Duplicate Packets, Delay and Jitter.   With additional RTP Video Traffic Generation (PKS106) licenses up to 500 simultaneous video streams can be simulated using H.263 and H.264 codecs. H.263 provides video capture and video conference monitoring capability, while H.264 is an industry standard codec for video compression. 

RTP Voice Quality Measurements (PKS108)

RTP Video Traffic Generation (PKS106)

GL’s test tools support FAX over IP (FoIP) simulation and monitoring with additional licensing RTP G.711 Pass Through Fax Simulation (PKS200) and T.38 Fax Simulation over UDPTL (PKS211).

GL’s RTP Fax Simulator simulates multiple fax calls over IP in T.30 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, and record complete fax call messages as log file along with a Tiff image.

GL’s RTP Fax over UDPTL transport simulates multiple fax calls over IP using T38 protocol (compliant with ITU-T T.38 (03/2002)) up to maximum of 33.6 kbps speed.

Almost all MAPS™ IP products support fax simulation –MAPS™ SIPMAPS™ SIP-IMAPS™ MEGACOMAPS™ BICCMAPS™ GSM, and MAPS™ UMTS.

T.38 Fax call in progress
Typical applications of our Fax Emulation software are load testing of fax servers, qualification testing of T.38 Gateways, testing of ATAs (Analog Terminal Adapters), testing of fax machines, and many more.

User Plane Traffic Simulation for LTE, UMTS, and GPRS Networks

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. GTP traffic is identified by a Tunnel ID with multiple HTTP connections. GL now offers an End-to-End Simulation of a Wireless Network, including user equipment access to HTTP services via network elements, with all components such as Base Station, RF channel, and GPRS core elements (SGSN / Signaling Gateway, GGSN / PDN Gateway), combined with mobile gateway traffic emulation.

The solution includes Mobile IP traffic (ETH101 / PacketLoad), Packet traffic (ETH100 - BERT, Hex String, and HDL File) and Mobile Gateway traffic (ETH102) types of traffic simulation. These modules also support generation and verification of data traffic such as Email, FTP, Web (HTTP), Video, and more.

The below diagram depicts the GL’s MAPS™ platform’s capability in generating user plane traffic with different modules.

GTP (GPRS Tunneling Protocol) Traffic Simulation

GTP Mobile Traffic Simulation is supported in MAPS™ LTE S1MAPS™ LTE eGTPMAPS™ UMTS Gn GpMAPS™ IuPSMAPS™ UMTS IuH, MAPS™ GSM Abis IPMAPS™ GSM A IP, and MAPS™ GPRS Gb applications only.

It includes following modules –

  • Packet Traffic Simulation - GTP (ETH100) - This module is used for stateless end-to-end data verification by generate IP traffic and verify the same at the other end over GTP (GPRS Tunneling Protocol). The IP traffic can be generated as Sequence Number, Hex string, BER patterns, or playback captured Ethernet traffic (*.HDL) files.

  • Mobile Traffic Core - GTP (ETH101) - module supports stateful user-plane packet transmission and reception services between any two nodes (GTP-U protocol entity) in UMTS (SGSN, GGSN, RNC), and LTE (SGW, PDNGW) networks.  It allows simultaneous simulation of multiple sessions per user. Currently, supports HTTP traffic simulation with the base requirements such as port number, server IP address, and pre-canned HTTP traffic file. Each GTP traffic is identified by a Tunnel ID, UDP port (2152 is default for GTP-U traffic), and the multiple HTTP connections are differentiated by Connection ID. The Mobile Traffic Core-GTP (ETH101) module can also support generation and verification of data traffic such as Email, FTP, HTTP, and more.

Mobile Traffic Core – GTP Protocol Stack
  • HD Mobile Traffic Core - GTP (PacketLoad) – GL’s MAPS™ platform with PacketLoad appliance provides high density (up to 4 Gbps) stateful TCP/HTTP, UDP, and PCAP Replay traffic simulation solution in UMTS (SGSN, GGSN, RNC), and LTE (SGW, PDNGW) networks. PacketLoad is a 1U network appliance that includes 4 x 1GigE ports supporting total capacity of up to 4 Gbits/sec stateful packet traffic generation. 

    Download the PacketLoad brochure for more details.

    It allows simultaneous simulation of multiple sessions per user.  Currently, PacketLoad supports HTTP traffic simulation with the base requirements such as port number, server IP address, and pre-canned HTTP traffic file.
    To verify bearer allocation bandwidth at the end points, the packet traffic can be generated with GL’s MAPS™ UMTS / LTE simulators along with PacketLoad module that allow to encapsulate the generated packet data within GTP headers and transmit through the gateway points such as SGSN & GGSN, or SGW & PGW.

    At the other end, MAPS™ with PacketLoad is used to verify the received data with the various statistics like Total packets transmitted and received, Latency, Delay, Bandwidth, No of TCP connection created, Successful connection, Packet loss, and so on.

PacketLoad connected to MAPS™ in the network

High Density Packet Traffic Simulation

  • Mobile Traffic Core – Gateway (ETH102) - This module allows simulation of Gateway and transfer user plane data from RNC to GGSN. It handles GTP tunnels on both direction of SGSN. It can also act as GGSN for user-plane traffic by encapsulating IP traffic over GTP. This module is supported in MAPS™ GnGpMAPS™ LTE S1MAPS™ LTE eGTP-c

Mobile Gateway Traffic Simulation
  • Mobile Traffic Simulation - GPRS Gb (ETH103) - This module allows simulation of Mobile traffic over Gb interface between BSC and SGSN. Currently, this module transmits the pre-canned HTTP file (*.txt) between BSC and SGSN nodes. It multiplexes both signaling and traffic over Gb interface. This module is supported in MAPS™ GPRS Gb.

Traffic Simulation - CLI

In addition to the GUI, all the traffic simulation action within MAPS™ can be automated and controlled remotely through a Command Line Interface (CLI). All of the GUI based functionalities are available in CLI. Supported clients include C++, TCL, Python and others.

Traffic simulation on a local network as well as from a remote location is possible with the client interface.

Traffic Simulation between IP to TDM

Buyer's Guide

Please Note: The XX in the Item No. refers to the hardware platform, listed at the bottom of the Buyer's Guide, which the software will be running on. Therefore, XX can either be ETA or EEA (Octal/Quad Boards), PTA or PEA (tProbe Units), UTA or UEA (USB Units), HUT or HUE (Universal Cards), and HDT or HDE (HD cards) depending upon the hardware.

Item No. Item Description
  GTP Mobile Traffic Options



Mobile IP Traffic Core (< 1Gbps) –

PacketLoad - HD Mobile IP Traffic Core (up to 4 Gbps)
Mobile IP Traffic Core - Gateway
Mobile Traffic Core - Gb
  TDM Traffic Options
File based Record/Playback (includes xx600)
Transmit/Detect digits (Place Call/ Answer Call) (includes xx600)
Multi-Channel TRAU Tx/Rx Emulation and Analysis


WCS Fax Emulation Software
2 Fax ports licenses
8 Fax ports licenses
30 Fax ports licenses
60 Fax ports licenses
120 Fax ports licenses

  RTP Traffic Options
PKS102 RTP Soft Core for RTP Traffic Generation
PKS103 RTP IuUP Softcore
PKS106 RTP Video Traffic Generation




RTP Voice Quality Measurements



RTP Pass Through Fax Emulation

2 Fax Ports Licences
8 Fax Ports Licences
30 Fax Ports Licences
60 Fax Ports Licences
120 Fax Ports Licences

  Related Products
XX693 MAPS™ GSM Abis
XX647 MAPS™ SS7 Conformance Scripts
XX651 MAPS™ CAS Protocol Emulator
XX624 MAPS™ FXO FXS Emulator
SIP Conformance Test Suite (Test Scripts)
MAPS™ MEGACO Conformance Test Suite (Test Scripts)
MAPS™ MGCP Protocol Emulation with Conformance Test Suite
PKS137 MAPS™ GSM A over IP Emulator
PKS140 MAPS™ LTE S1 Emulator
PKS142 MAPS™ LTE eGTP (S3, S4, S5, S8, S10, S11 & S16) Emulator

MAPS™ UMTS IuCS Interface Emulation
MAPS™ UMTS IuH Interface Emulation

PKS164 MAPS™ UMTS IuPS Interface Emulator
PKS166 MAPS™ UMTS - Gn Gp Interface Emulation


MAPS – Gb Emulator over IP for BSC & SGSN

  Related Software


SS7 Analyzer Software


ISDN Analyzer Software


PacketScan™ (Online and Offline)


RTP Toolbox™


SIGTRAN Analyzer (requires PKV100)


LTE (Long Term Evolution) Analyzer (Optional with PacketScan™)

FaxScan for T.30
FaxScan for T.38
GL Insight - Single Modem Analysis – TDM
GL Insight - Single Modem Analysis - IP
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