How to Modify the Filter of H225-RAS Ports

This page describes how to configure the protocol filter with the following features:

  • Setting the UDP ports

Connecting the unit and setting the test conditions:

The Clarinet-Book USB unit connections and the test condition settings for basic H323 communication using the H245 procedures are detailed in the following page:

Setting the test conditions for H323 filter

The protocol filter file Lan_auto_h323.acf   (created with the Wizard from the Template list) specifies the stack of protocol. As the IP protocols are automatically detected by the protocol value, the stack defined in the "Protocol specification"  has the layers D3 to D7 set to "Automatic"

However the ports used by H225-RAS, H225-Signalling and RTCP/RTP may change.

The ports values are specified in the panel:

 Protocol specification èParameters è (DataLink)-Ports 

This panel shows 3 ranges of ports which are used sequentially (step1, then step2, then step3) to decode the protocols according to the port values:

  • 1- Port numbers (dst or src): each value of the ports corresponds to the "well-known" values used by the protocol stack defined in Protocol(n), Protocol(n+1), Protocol(n+2), Protocol(n+3).
  • 2- Attempt to decode: the values which have not been decoded by step1 correspond generally to regular protocols:
    • UDP ports: attend to decode RTP/RTCP protocols
    • TCP ports: attend to decode TPKT protocol and then:
      • H225 signalling over T123-TPKT
      • X224 over T123-TPKT
  • 3- Default ports: the values which have not been decoded by step1 and step2 could correspond to default protocols:
    • UDP ports : attempt to decode H225-RAS protocol
    • TCP ports: attempt to decode H245 protocol 
    • .....

 Example: Port number=1719 correspond to UDP +  H225-RAS. 

If you use non-standard ports to carry IP traffic, the Default port specified for UDP will attempt to decode H225-RAS over these ports and this will cause an error in the ASN1 fields to be generated.

The Default port value for UDP H225-RAS should be removed to avoid these attempts.

 

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