asterisk users - Aug 2013 - Need to figure out DAHDI logical group from CDR record

I have a bunch of CDR records in the mysql database "asteriskcdrdb" on
a FreePBX system. There is a DAHDI trunk defined in FreePBX which uses the
"gN" identifier to make calls. So in this setup the trunk is roughly
equivalent to a DAHDI logical group. I
want to know, given a CDR, which logical group (and therefore, trunk) was used
to place the call, or was used to receive the call.

In Asterisk 1.6 and lower, the DAHDI channel encoded the B channel, as in
DAHDI/aaa-bbb where aaa was the ISDN B channel. Since, as far as I can see, the
logical group groups channels together, the strategy was to ask Asterisk for the
dahdi groups, list
the B channels, and fetch the records that referenced those B channels.

In Asterisk 1.8, this no longer works. Since the DAHDI channel name no longer
references a B channel ( https://issues.asterisk.org/jira/browse/ASTERISK-17229)
I can no longer extract the B channel to associate a particular CDR with a
particular logical
group, Though, I am not particularly interested in the B channel, except as a
means to build the association.

Is there a way to guess the logical group given the standard CDR fields? All of
the strategies I can think of require adding new fields to asteriskcdrdb, which
does nothing to help me with the CDR records already written.

The strategies for future association involve using the dialplan to capture
CHANNEL(dahdi_span/dahdi_channel/dahdi_type) and writing this information in
additional fields in asteriskcdrdb. However, some field to inform the logical
group would be more
useful for me.
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