assuming MTP3 is on the board, you redirect 0x22 to 0x20, so when you send to MTP3 it is redirected to the board. if you run MTP3 on the host, you won't need this redirect command. when MTP3 will deliver the message to the application, it delivers by default to 0x33 for sccp or to 0x23 for ISUP. if you want to grab MTP3 message directly, you need to configure an MTP_USER_PART in config.txt
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