Clarinet H323 features


The Clarinet-system is a powerful Protocol Test platform supporting VOIP  family (H323 & SIP) protocol over Ethernet, ATM, ISDN, and  Vseries  interfaces. It offers a wide variety of functions:
  • Monitoring
  • Programmable simulation
  • Emulation


Large snapshot


The flexibility and the user-friendly interface of the software provides the user with a way to use it for product development, engineering, or field trials.

Standard Features

Interface connection
Analysis Functions
Emulation functions
Programmable simulation

Interface Connection

Physical Interface

  • Ethernet 802.3 interfaces 10/100M
  • One Data link (B channel) over ISDN BRI and PRI interfaces
  • One Data link over V24, V35, V36, X24  interfaces.
  • One data-channel (1 TS) + One data-channel (1-31 aggregated TS) over E1 interfaces
  • One data-channel (1 TS) + One data-channel (1-24 aggregated TS) over T1 interfaces
  • Two data-channels (vcc) over STM1 & E3 interfaces

Analysis Functions

Protocol Event Generation

  • Ethernet: MAC 802.3 events,
  • Vseries Asynchronous  events
  • E1, T1 Data channel:  BOP events,
  • ATM: CS-PDU events

Statistics Event Generation

  • Event counters
  • Counters by PDUs type on IP, TCP...
  • Data-flow counters for low layer

Protocol Specification for Display

  • Each channel specified with a protocol stack of 7 decoding levels:
    • MAC / BOP envelope,
    • IP layers decoding:
      • LCP,  PPP, Cl-IP
      • IP family: TCP, PAP, CHAP, ARP
      • IPX
    • H323 family
      • TPKT, H225, H245, T123, T125, RAS, RTP, RTCP, X224
      • Full H323 ASN1 PER decoding
      • IP addresses, UDP/TCP port identifications
  • Event-Editor functions for events formatting and  filtering

Simulation Functions

Simulation features

  • IP simulation
    • Datagrams exchange:
      • Generator (1 to 50 destinations)
      • Responder (from different destinations)
    • Automatic fragmentation and reassembly procedure
  • TCP simulation
    • Establishment of communications:
      • Generator (1 to 50 destinations)
      • Responder (from 20 destinations)
    • Automatic fragmentation and reassembly procedure
  • H323 Automatic Simulation:

    Behavior: Generator (1 to 50 outgoing SETUP's) and/or responder (acceptance, 50 incoming SETUP’s).
    • Independent outgoing communications defined by:
      • delays and IE buffer for SETUP, RELEASE COMPLETE.
      • number of repetitions and inter-communications delay.
      • RTP active source.
    • Identical incoming communications defined by:
      • ACCEPT/REJECT behaviour.
      • Transmission option and IE buffer for CALL-PROC, ALERT, CONNECT, RELEASE COMPLETE.
      • Delay before CONNECT.
      • RTP active source.
    • Manual commands: CALL, CLEAR, Miscellaneous (FACILITY..)
    • Outgoing communications triggered by:
      • Starting delay.
      • Manual commands.
    RAS optional  management.
    • Registration
      • Edition of GRQ, RRQ 
      • Gatekeeper discovery and Registration (Timetolive management)
    • Admission 
      • Edition of ARQ for each communication
        ASN1 PER editor for H225/H245/RAS messages 

    More about 323 simulation

Emulation Functions

MAC Layer: 

  • Setting of Parameters: address and header

IP layer:

  • Setting of Parameters: address and header

TCP layer

  •  Setting of Parameters: Port and header

H323 layer

  •  Setting of Protocols RAS, H245 , H225 and Parameters (time-limits)

Programmable Simulation


  • Use of CLARINET-Development C language
  • Microsoft format library.
  • Level N simulation using N-1 emulation on SS7 channel.

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Last modification: 27/02/04