DPNSS dissector C/R bit

["Keith French" <keithfrench () btconnect com>]

DPNSS uses the Command / Response bit from Octet 1 of the Address field to determine the direction of the layer 2 frame 
from either PBX A or PBX B.

If the C/R bit is set to 1 this indicates a Command frame from PBX A, or a Response frame from PBX B.
If the C/R bit is set to 0 this indicates a Command frame from PBX B, or a Response frame from PBX A.

I am trying to add a custom column to show the direction of Command frames, if I use the filter:-

dpnss_link.crbit

The column just shows:-

"Command/Response bit set" or "Command/Response bit cleared".

Is there a way I can add a direction column that would just show "PBX A" or "PBX B"?

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