How to simulate H323 over Ethernet

This page describes the way to simulate an H323 End-Point with the following features:

  • connection to an Ethernet network
  • registration from a Gatekeeper by using H225-RAS
  • establishment of signalling channels by using H225
  • establishment of media channels by using H245

Connecting the unit

The Clarinet Book USB Ethernet 10/100 uses the RJ45 or AUI port and can be connected  to a 10B2 BNC connector by using:

  • an external transceiver (provided as an accessory) AUI-10B2 
  • the power supply of the Clarinet-Book which provide the power to the transceiver

Setting the test conditions for Ethernet profile

A new profile can be created  with the Wizard from the Template list by selecting:

  • LAN application.
  • Profile with a description including LAN, Simu, PH=10BT DL=H323 RAS
  • Filter with a description including  DL= MAC802.3/Auto/H323

Example using the wizard:

  • ProfileèNewèLANèlan_simu_h323_endpoint_RAS.acpèFilter?èLan_auto_h323.acf

The IP-type simulation profile H323_simu_mac_endpoint_RAS.aip invoked by the lan_simu_h323_endpoint_RAS.acp is automatically copied in the same directory. 

Both profiles (*.acp and *.aip) resulting from the wizard is ready for H323 simulation over an Ethernet 10 Mbits interface.

Modifications can apply to the profile lan_simu_h323_endpoint_RAS.acp

  • about physical interface:
    • IEEE 802.3 Init:  RJ45 10 Mbits or 100 Mbits.
      see also item Monitor Tx messages in Interface specification
  • about IP call simulator name
  • about acquisition limited to a set of MAC addresses
  • Save the profile under a new name:
    • ProfileèSave asèfilename.acp.

Most of the modifications apply to the profile H323_simu_mac_endpoint_RAS.aip resulting from the copy

Setting the addresses for basic H323 simulation profile

Profile H323_simu_mac_endpoint_RAS.aip  needs to have some modifications of the default addresses:

  • Open the profile:
    • ProfileèOpen IP...èH323_simu_mac_endpoint_RAS.aip.

  • Modifications to setup the MAC and IP addresses of the H323 Endpoint:

    • Changing the MAC address: Initialize Initialize Emulator èMAC 
      Setting the value of Own Ethernet address (hex)
    • Changing the IP address: Initialize Initialize Emulator èIP 
      Setting the value of Own IP address
      This IP value will update automatically the sources IP addresses in the H225 messages  

  • Modifications to setup the RAS parameters of the H323 Endpoint:

    • Changing the Gatekeeper address Initialize Emulator èH323 èRAS settings 
      Setting the value of IP address port  of the Gatekeeper Lookup table

  • Modifications to setup the RAS messages used by the H323 Endpoint :

    • Changing the address Initialize Emulator èH323 èRAS settings èEncode RAS messages 
      Setting the ASN1 content of Gatekeeper Request (GRQ)  (Endpoint Alias)
      Setting the ASN1 content of Registration Request (RRQ)  (Terminal Alias)

  • Modifications to setup the RAS and H225 messages used by the H323 Endpoint :

    • Changing the destination address Generator èH323Destination1 èEdit 
      Setting the value of Dest IP address
      It is used only when  RAS is de-selected in Initialize Emulator èH323 èRAS settings This value will automatically update in the H225 messages all the Destination IP addresses set to 0.0.0.0. 
    • Changing the source address Generator èH323Destination1 èEdit èRAS messages 
      Setting the ASN1 content of Admission Request (ARQ)  
      Setting the ASN1 content of the  field h323-ID  (default "CLA241", e164 : "241")  

    • Changing the source address Generator èH323Destination1 èEdit èSetup èUser-User èCoding 
      Setting the ASN1 content of the  field h323-ID :  (default "CLA241", e164 : "241") 

  • Save the profile under a new name:
    • ProfileèSave asèfilename.aip.
  • Select this new name in the LAN profile and save it.
    • ProfileèSave asèfilename.acp.

Changing the TCP and UDP ports for H323 simulation profile

Profile H323_simu_mac_endpoint_RAS.aip resulting from the copy could have some modifications of the default ports:

  • Modifications to setup the range of TCP Ports addresses of the H323 Endpoint:

    • Changing the Gatekeeper address Initialize Emulator èH323 èTCP parameters 
      Setting the range of values of Ports  used by H225 signalling messages
      This value will update automatically the Port addresses in each H225 communication 

  • Modifications to setup the range of UDP Ports addresses of the H323 Endpoint:

    • Changing the Gatekeeper address Initialize Emulator èH323 èUDP parameters 
      Setting the range of values of Ports  used by RTP and RTCP messages
      These values will update automatically the Port addresses of RTP/RTCP messages in each communication 

Running the profile

The profile is ready to generate one outgoing call and to terminate any incoming call for 30 seconds.

To launch the profile:

  • Select Profile->Run or click over horse_on.gif (968 octets) . It allows to select the name of profile. See Running a test
  • The windows of the Event-Editor is automatically opened.

To stop the profile

  • Click over horse_off.gif (975 octets)  See: Stopping a test
  • The window of the Event-Editor is automatically close

Troubleshooting over Ethernet

  • No messages displayed on the Event-Editor windows. Check if the LED of the Clarinet Book show activity over LAN interface 

 

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updated:  27-Feb-04