Central Office Switching Simulator

13th, Sep 2019

Welcome to the September 2019 issue of GL Communications' Newsletter providing insight into our latest product release, MAPS™ Central Office Switching Simulator - which provides a single solution for testing traffic and signaling across PSTN, IP and TDM networks in one platform.

Central Office Switching Simulator

MAPS™ (Message Automation and Protocol Simulation) Central Office Switching Simulator converts a PC (portable, tower, rackmount) into a digital central office switch simulator, PBX and switch, complete with T1, E1, POTS, and IP interfaces.

MAPS™ Central Office Switching Simulator is ideal for simulating and testing advanced telecom infrastructure including PBX, switches, gateways, and transmission systems. The simulator performs complex switching functions for routing PSTN to TDM calls while providing voice/data throughput and protocol conversion during call switching. MAPS™ can emulate both ends (or one end) of a complex switching network, and the switching equipment itself such as the SS7 SSP for routing TDM calls to/from local PSTN telephone exchange.

All signaling and traffic actions are easily controlled via scripts and provides all the flexibility required from a telephony test equipment.

The Central Office Switching Simulator can also be used to verify all PSTN, IP and T1/E1 signaling protocols over different transport within the network infrastructure. These protocols include T1/E1 CAS, PRI ISDN, SS7, and IP protocols. It can also generate traffic such as digits, tones, voice files, fax, and more.

Analog - ISUP Call Conversion Functionality

The MAPS™ Central Office Switching Simulator can be configured as a high-density switch, which supports large volumes of various traffic including voice, fax, modem, and tones.

Being a self-contained system with capabilities to easily communicate with external networks, the MAPS™ Central Office Switching Simulator can switch calls originating from PSTN network to SS7 and vice versa.

The following screenshot depicts MAPS™ Central Office Switching Simulator configured to switch and route incoming SS7 calls to analog (FXO) terminal. MAPS™ CO receives the called number in the SS7 Initial Address Message and uses the Called Party Number to identify the subscriber on the FXO side and routes the call on the associated timeslot/trunk towards FXO.

SS7 calls to analog (FXO) terminal

The following screenshot depicts MAPS™ Central Office Switching Simulator configured to switch and route incoming analog calls to SS7 system. Each FXS line is configured with a calling number (ANI) and is associated with the timeslot/trunk. When the PSTN call is received, MAPS™ CO forwards the received dialed number to SS7 system and switches the incoming analog call based on the number dialed (called/calling number).

Analog (FXO) terminal to SS7 calls


  • A single-box system to test central office, PBX, gateways, analog/ IP networks
  • Provides complete network infrastructure for PSTN, IP, digital T1/E1 trunks, SS7, ISDN, and POTS (Plain Old Telephone System)
  • Call switching/routing among TDM-PSTN networks with protocol conversion capability
  • Automatic bulk call generation/reception for load testing
  • Automate call establishment and traffic generation / detection process through scripts
  • Monitor voice quality using PESQ (ITU-T P.862.1/2), POLQA (ITU-T P.863)
  • Call status/graphs, link status, message statistics, capture events, error events, user-defined call statistics and graphs
  • APIs and CLI access through multiple command-line based clients (Java, VBScripts, TCL, and Python)
  • Unlimited number of remote client user access using remote controller client-server module

For detailed information refer to MAPS™ Central Office Switching Simulator webpage.

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