parsing detail files myself

[Ming-Ching Tiew]

As a follow on the my requirement of reading the detail file and updating 
them into MSSQL database, I have written a program to parse the content 
of the file, which is produced by ***ONE*** single Cisco box sending 
data to free radius 1.04, and this is what I noticed, I need someone to tell me 
if this is  an expected behaviour or somewhere there is something wrong :-

My observations :-

1. The number attributes in a records ( ie the number of lines in a "record" ) 
    is not consistent. I have skipped those Cisco-AVPair in the files,
    and this is the stats :-

 acount=25, value=0
 acount=26, value=0
 acount=27, value=0
 acount=28, value=0
 acount=29, value=14
 acount=30, value=16
 acount=31, value=7290
 acount=32, value=6724
 acount=33, value=0
 acount=34, value=0
 acount=35, value=0

In other words, in my detail file, there are 14 records which have 29
attributes, 16 records with 30 attributes, 7290 records which have 31
attributes and 6724 records with 32 attributes. Question is why don't
they have the same number of attributes ? 

2. Not only that, the occurances of the attributes are not consistent
    either :-

attrib=Acct-Authentic, occurance=14043
attrib=Acct-Delay-Time, occurance=14043
attrib=Acct-Input-Octets, occurance=14043
attrib=Acct-Input-Packets, occurance=14043
attrib=Acct-Output-Octets, occurance=14043
attrib=Acct-Output-Packets, occurance=14043
attrib=Acct-Session-Time, occurance=14043
attrib=Acct-Status-Type, occurance=14043
attrib=Acct-Unique-Session-Id, occurance=14055
attrib=Called-Station-Id, occurance=14043
attrib=Calling-Station-Id, occurance=14013
attrib=Cisco-NAS-Port, occurance=6194
attrib=Client-IP-Address, occurance=14045
attrib=NAS-IP-Address, occurance=14043
attrib=NAS-Port, occurance=6194
attrib=NAS-Port-Type, occurance=6194
attrib=Service-Type, occurance=14043
attrib=Timestamp, occurance=21349
attrib=User-Name, occurance=14013
attrib=gw-final-xlated-cdn, occurance=545
attrib=gw-rxd-cdn, occurance=14043
attrib=h323-call-origin, occurance=14043
attrib=h323-call-type, occurance=14043
attrib=h323-conf-id, occurance=14043
attrib=h323-connect-time, occurance=14043
attrib=h323-disconnect-cause, occurance=14043
attrib=h323-disconnect-time, occurance=14043
attrib=h323-gw-id, occurance=14043
attrib=h323-incoming-conf-id, occurance=14043
attrib=h323-remote-address, occurance=7849
attrib=h323-setup-time, occurance=14043
attrib=h323-voice-quality, occurance=14043
attrib=session-protocol, occurance=7849
attrib=subscriber, occurance=14043

Take for example, why Cisco NAS port has such low occurances
in the detail file ? Similarly why h323-remote-address has such
a low occurances ?

Is it a Cisco thingy or  free radius did not parse what Cisco sent correctly ?

Appreciate any help or comments.