Write 3GPP attributes accounting into mysql problem

[bit1]

Hi Freeradius-Users
May be some of you facing with this problem, but I haven't a proper solution yet. 
I have a freeradius 2.2.0 and mysql 5.5.28. I would like to write (and of course aggregate) accounting records into mysql db. I 'v tried to modify the dialup.conf to extract the 3GPP radius attributes as well as the standard 
attributes (appended extra fields, db schema modified as well).
        accounting_start_query = " \
          INSERT INTO ${acct_table1} \
            (acctsessionid,    acctuniqueid,     username, \
             realm,            nasipaddress,     nasportid, \
             nasporttype,      acctstarttime,    acctstoptime, \
             acctsessiontime,  acctauthentic,    connectinfo_start, \
             connectinfo_stop, acctinputoctets,  acctoutputoctets, \
             calledstationid,  callingstationid, acctterminatecause, \
             servicetype,      framedprotocol,   framedipaddress, \
             acctstartdelay,   acctstopdelay,    xascendsessionsvrkey, test,fullpacket) \
          VALUES \
            ('%{Acct-Session-Id}', '%{Acct-Unique-Session-Id}', \
             '%{SQL-User-Name}', \
             '%{Realm}', '%{NAS-IP-Address}', '%{NAS-Port}', \
             '%{NAS-Port-Type}', '%S', NULL, \
             '0', '%{Acct-Authentic}', '%{Connect-Info}', \
             '', '0', '0', \
             '%{Called-Station-Id}', '%{Calling-Station-Id}', '', \
             '%{Service-Type}', '%{Framed-Protocol}', '%{Framed-IP-Address}', \
             '%{%{Acct-Delay-Time}:-0}', '0', '0','%{request:3GPP-IMSI}','%Z')"

But the '%{request:3GPP-IMSI}' does not work, it is empty, however the '%Z' countains the full accounting packet. It seems the 3GPP-* runtime variable does not get value or may be the format is wrong.
I'v made a not so elegant solution with mysql-udf-preg and regexped the necessary attribs from full packet , but i think it could be too slow with more attribs/inserts. 
Do you have any idea how to solve this issue?
Dohány Tibor
mailto:bit1 at freemail.hu