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ISDN Analysis and Simulation

ISDN PRI over T1 E1 | ISDN PRI over IP | ISDN Network Surveillance

ISDN over T1 E1


The ISDN service for carrying analog and digital voice /data is provided in two flavors:

  • Primary rate B-channel interface (PRI) structure - 30 thirty B-channels and one 64 kbit/s D-channel, (30B+D) - this service is suitable for the large enterprises with a speed of 1984 kbps
  • Basic rate interface (BRI) structure - two B-channels and one 16 kbit/s D-channel (2B+D) this service is suitable for the home and small enterprise with a speed of 144 kbps


pdf ISDN Test Platforms

ISDN PRI Emulation over T1 E1

ISDN PRI Emulator (GUI based) can emulate a complete ISDN connection (switch to subscriber) all in the same PC and test ISDN products designed for either U or S/T interface, including network terminations, Type 1 terminating equipment, and terminal adapters. Visit

ISDN PRI Emulator (Script based) - Visit

Scripted ISDN Emulator (based on MAPS™ Architecture) that can do almost anything with versatile framework, and powerful scripting, including conformance testing, and support for high volume of T1s and E1s. Visit

ISDN Emulation for Voice Quality Testing and Analysis uses USB Lite platform with GL’s VQuad™ for T1 E1 line interfacing and provides QoS measurements. Visit

ISDN PRI Analysis over T1 E1

GL’s supports capture, decode, and simulation of ISDN PRI interface with the following list of products.

ISDN PRI Analyzer - Classic and complete ISDN PRI D-Channel Analysis, NFAS and every Variant for T1 E1 lines, Ladder diagrams, CDRs, and a lot more. Visit

PRI ISDN Triggered Call Capture and Analysis - captures a call based on ISDN signaling; the ISDN signaling and the voiceband capture are available for viewing. Visit

Complete Storage and Analysis of every ISDN PRI Call on any number of T1 or E1 lines, includes Voiceband and signaling information. Visit

T1, E1 analysis - Visit hardware platforms page.

T3, OC-3, STM-1 analysis - Visit page.

ISDN over IP

ISDN signalling over IP can be captured, analyzed, and simulated using GL’s ISDN products. Following is a brief list of products supporting testing of ISDN over IP

ISDN PRI Emulation over IP

Simulation of SIGTRAN ISDN over IP (MAPS™ SIGTRAN ISDN) can simulate a complete ISDN connection between SG (Signaling Gateway) to MGC (Media Gateway Controller), where ISDN signaling are as defined by the ITU-T Q.921 / Q.931 standards.  Visit

Simulation of SIP-ISUP over IP (MAPS™ SIP-I) can simulate Signaling Gateway / Softswitch as a User Agents Client (UAC), which sends SIP requests with ISUP message and User Agent Server (UAS), which receives the requests as Signaling Gateway / Soft switch and returns a SIP response with proper ISUP message attached. Visit

ISDN PRI Analysis over IP

SIGTRAN ISDN over IP Protocol Analyzer - SIGTRAN protocol decoder software for ISDN and SS7 signaling messages over IP. Visit

Offline SIGTRAN ISDN over IP Protocol Decoder software for ISDN and SS7 signaling messages over IP. (remote protocol analyzers page)

Online and Offline Packet Analysis - includes SIP-I and SIP-T decodes, these carry ISUP (ISDN) signaling. Visit

Network Surveillance and Monitoring Products for PRI ISDN Networks

Console based Decode Agent for ISDN to build your own Network Surveillance and Monitoring of ISDN PRI Networks. Visit

Complete Network Surveillance System for ISDN PRI Networks, monitor signaling, collect  CDRs,  WEB Server and Browser for ISDN PRI Network Surveillance Visit

Automatic detection of ISDN Protocols - Visit

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