freeradius authorization without "username"

[???????, ?? ????????]

I have a freeradius, and I need "Calling-Station-Id" for authorization. This is the one attribute, which I select in the radiusd.conf

checkval {
                # The attribute to look for in the request
                item-name = Calling-Station-Id

                # The attribute to look for in check items. Can be multi valued
                check-name = Calling-Station-Id

                # The data type. Can be
                # string,integer,ipaddr,date,abinary,octets
                data-type = string

                # If set to yes and we dont find the item-name attribute in the
                # request then we send back a reject
                # DEFAULT is no
                notfound-reject = yes
        }
(But in fact, I do not use this)

Why, when freeradius rescieve the access-request packet, and "username" field is empty, then we got access-denied?
I use SQL authorization module.
In the database (I use it as a blacklist, id Calling-Station-Id exist in the list, then access denied.):
+----+------------+-----------+----+--------+
| id | UserName   | Attribute | op | Value  |
+----+------------+-----------+----+--------+
|  2 | 3339222222 | Auth-Type | == | Reject |
|  1 | all_users_not_in_black_list        | Auth-Type | == | Accept |
+----+------------+-----------+----+--------+

>From sql.conf:
authorize_check_query = "SELECT id, UserName, Attribute, Value, op \
          FROM ${authcheck_table} \
          WHERE Username = IF(Username='%{SQL-User-Name}','%{SQL-User-Name}','all_users_not_in_black_list') \
          LIMIT 1"
        authorize_reply_query = "SELECT id, UserName, Attribute, Value, op \
          FROM ${authreply_table} \
          WHERE Username = 'all_users_not_in_black_list' \
          ORDER BY id"

So, info from radiusd in debug mode:

rad_recv: Access-Request packet from host XXX.XXX.XXX.XXX:1812, id=182, length=113
        NAS-Identifier = "ggsn2"
        User-Name = ""
        User-Password = ""
        NAS-IP-Address = XXX.XXX.XXX.XXX
        NAS-Port-Type = Virtual
        Called-Station-Id = "1000"
        Calling-Station-Id = "3339222225"
        Acct-Session-Id = "d45d6126057478b1"
        Acct-Multi-Session-Id = "d45d61260000b77a"
  Processing the authorize section of radiusd.conf
modcall: entering group authorize for request 0
radius_xlat:  '/usr/local/var/log/radius/radacct/auth-detail.log'
rlm_detail: /usr/local/var/log/radius/radacct/auth-detail.log expands to /usr/local/var/log/radius/radacct/auth-detail.log
  modcall[authorize]: module "auth_log" returns ok for request 0
rlm_sql (sql): zero length username not permitted
  modcall[authorize]: module "sql" returns invalid for request 0
modcall: leaving group authorize (returns invalid) for request 0
Invalid user: [/] (from client ggsn2 port 0 cli 3719248521)
Sending Access-Reject of id 182 to XXX.XXX.XXX.XXX port 1812

I don't care, what kind of username do we have! How I can avoid this problem? :-( Can someone help me with this quesion?

Here is the part of my radiusd.conf file:
<...skipped...>
modules {
        checkval {
                # The attribute to look for in the request
                item-name = Calling-Station-Id

                # The attribute to look for in check items. Can be multi valued
                check-name = Calling-Station-Id

                # The data type. Can be
                # string,integer,ipaddr,date,abinary,octets
                data-type = string

                # If set to yes and we dont find the item-name attribute in the
                # request then we send back a reject
                # DEFAULT is no
                notfound-reject = yes
        }

        preprocess {
                huntgroups = ${confdir}/huntgroups
                hints = ${confdir}/hints

                with_ascend_hack = no
                ascend_channels_per_line = 23

                with_ntdomain_hack = no

                with_specialix_jetstream_hack = no

                with_cisco_vsa_hack = no
        }

        # Livingston-style 'users' file
        #
        files {
                usersfile = ${confdir}/users
                acctusersfile = ${confdir}/acct_users
                preproxy_usersfile = ${confdir}/preproxy_users

                #  If you want to use the old Cistron 'users' file
                #  with FreeRADIUS, you should change the next line
                #  to 'compat = cistron'.  You can the copy your 'users'
                #  file from Cistron.
                compat = no
        }

        # Write a detailed log of all accounting records received.
        #
        detail {
                detailfile = ${radacctdir}/acct-detail.log
                detailperm = 0600
        }

        detail auth_log {
                detailfile = ${radacctdir}/auth-detail.log
                detailperm = 0600
        }

        detail reply_log {
                detailfile = ${radacctdir}/reply-detail.log
                detailperm = 0600
        }

        $INCLUDE  ${confdir}/sql.conf

        radutmp {
                filename = ${logdir}/radutmp
                username = %{Calling-Station-Id}
                case_sensitive = yes
                check_with_nas = yes
                perm = 0600
                callerid = "yes"
        }

        radutmp sradutmp {
                filename = ${logdir}/sradutmp
                perm = 0644
                callerid = "no"
        }

        always fail {
                rcode = fail
        }
        always reject {
                rcode = reject
        }
        always ok {
                rcode = ok
                simulcount = 0
                mpp = no
        }

        expr {
        }

        digest {
        }

        exec {
                wait = yes
                input_pairs = request
        }

        exec echo {
                wait = yes
                program = "/bin/echo %{User-Name}"
                input_pairs = request
                output_pairs = reply
        }
}

instantiate {
}

authorize {
        auth_log
        #  See "Authorization Queries" in sql.conf
        sql
}

authenticate {
}

accounting {
        detail
        radutmp
}

session {
        radutmp
}

#  Post-Authentication
post-auth {
        reply_log
}

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