Now log into FreePBX admin interface in the server-manager, a create a new trunk, type "custom".
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Enter the common information, like any other trunk (caller ID, max call etc...)
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Then, enter the following for the dialstring:
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mISDN/g:trunks/$OUTNUM$
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Here, '''g:''' means we send the call to a group of ports defined earlier in /etc/asterisk/misdn.conf (in this example, we have craeted a group called '''trunks''', with all the four ports)
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You could also define a trunk per port with something like:
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mISDN/1/$OUTNUM$
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This would only send calls via the port number 1 of the card
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Now you can configure an outbound route to use this trunk and test if it's working.