GL Communications Inc.
Home >  Analysis (T1/E1/T3/E3/OC-3/OC-12/STM-1/STM-4) >  Software Applications >  Protocol Emulation

VoIP Network Testing w/ GL's Media Gateway

DCOSS Media Gateway


GL's Digital Central Office Switch Simulator (DCOSS) along with the GL's Media Gateway (MG) supports traffic and signaling testing of VoIP and TDM networks. The DCOSS / Media Gateway combination provides user friendly bulk call generation, scripting, and other automated call generation and reception for various voiceband traffic types including voice, fax, and modem traffic. It can be connected to any TDM or IP Phone, softphone, VoIP or TDM PBX, or TDM or VoIP Network / Cloud.

Product Brochure
View Presentation
  Supported Codecs
GL Product Lists

The DCOSS / Media Gateway supports internal traffic generation/ reception (Fax, Modem, Voice Files, Digits and Tones) as well as external traffic from optional analog 2-wire and BRI 4-wire interfaces. The DCOSS / Media Gateway supports a variety of different TDM and VoIP protocols.   Support for VoIP includes SIP, H.323, Megaco, MGCP, and T.38 fax. Support for TDM includes ISDN, SS7, and CAS. The following features are also supported: bulk calling, scripting, and remote client/server access.


  • Testing VoIP network elements, including IP phones, softphones, IP PBX
  • Fax and Modem traffic generation and verification
  • Stress testing with bulk call generation capability

Main Features:

  • Dual redundant Ethernet trunks
  • Call capacity up to 96 or 120 calls simultaneously (scalable depending on the GL Media Gateway selected)
  • Voice, Fax and Modem Call Generation and Reception
  • DTMF/MF Generation and Detection
  • Single/Dual Frequency Tone Generation and Detection
  • Call Monitoring and Recording
  • Automatic Bulk Call Generation/Reception for Load Testing
  • Bulk Call Scripting
  • Call Statistics and Call Detail Records
  • Save/Load all parameters as user-defined configurations

Media Gateway (Basic Configuration)

GL's Media Gateway (MG) in combination with GL's DCOSS is used to provide bulk call traffic generation for VoIP.


  • Supports up to 96 to 120 simultaneous connections using dual redundant Ethernet ports
  • Supports VoIP protocols such as SIP, H.323, and MEGACO, MGCP
  • Supports codecs such as G.711, G.726, G.723.1, G.720A, EVRC, and GSM-FR
  • Supports G.165 and G.168 Echo Cancellation with 32, 64, 125 ms tail length
  • Fax and Modem transport and T.38 Compliance
  • Supports VoIP per IETF RFC 2550 and 3551standards

Other Configurations

The MG can also be used with GL's T1E1 Analyzer for various call capture and analysis functions.

MG with USB T1 / E1 pod

MG with Universal T1 E1 Cards

DCOSS Related Links

Buyer's Guide:

Item No. Item Description
PKS150 DCOSS Media Gateway
DR001 DCOSS Software (R1 Protocol Included)
DT002/4 Dual/Quad T1 Card
DM001 DCOSS Fax License (per port)
  Related Software
FXT001 GL Insight - Single Fax Analysis - TDM
FXT002 GL Insight - Single Fax Analysis - IP
MDT001 GL Insight - Single Modem Analysis - TDM
MDT002 GL Insight - Single Modem Analysis - IP
PKS100 PacketGen™ (includes PacketScan™)
PKB100 RTP ToolBox™
PKV100 PacketScan™ (Online and Offline)





MAPS™ SIP Emulator

MAPS™ SIP Conformance Test Suite (Test Scripts)


MAPS™ MEGACO Conformance Test Suite (Test Scripts)

MAPS – MGCP Protocol Emulation with Conformance Test Suite

  Related Hardware
HDT001/HDE001 Legacy HD T1 or E1 (PCI) Cards with Basic Analyzer Software
HTE001 Universal T1/E1 Card with Basic Analyzer Software
UTE001 Portable USB based Dual T1 or E1 Laptop Analyzer with Basic Analyzer Software

* Specifications and features subject to change without notice.

 Back to Protocol Emulation Index Page

Home Page Sitemap Global Presence Email