Configure an IMSI range with an optional PLMN ID to associate with an
Operator Policy.
Privilege
Security Administrator, Administrator
Mode
Exec > Global Configuration > SGSN Global Configuration
configure > sgsn-global
Entering the above command sequence results in the following prompt:
[local]host_name(config-sgsn-global)#
Syntax
Syntax Description
imsi-range mcc mcc_num mnc mnc_num { msin first start_number last stop_number [ operator-policy policy_name [ description description ] ] | plmnid plmn_id operator-policy policy_name [ description description ] } +
no imsi-range mcc mcc_num mnc mnc_num { msin first start_number last stop_number | plmnid plmn_id }
no
Using
no in the command deletes the definition from
the SGSN Global configuration.
mcc
mcc_num
mcc
defines the mobile country code (MCC) of an IMSI.
mcc_num:
Enter a 3-digit number from 100 to 999 - 000 to 099 are
reserved.
mnc
mnc_num
mnc defines the mobile network code (MNC) of
an IMSI.
mnc_num:
Enter a 2 or 3-digit number from 00 to 999.
msin
MSIN (mobile subscriber international number) portion of the IMSI.
first
start_num:
Defines first MSIN prefix number in a range
last
stop_num:
Defines the last or final MSIN prefix number in a
range.
operator-policy
policy_name
description
description
Identify the operator policy that the IMSI range definition and/or the
PLMN-ID is to be associated.
policy_name : Enter a string of 1 to 64
alphanumeric characters.
description: Enter a string of 1 to 100
alphanumeric characters to provide range clarification for converted Release
9.0 configurations.
Description is just an information field.
From release 19.0 onwards the length of the string supported for this field has
been reduced, the supported range is now "1" up to "50" alphanumeric
characters. The reduction of the supported string size results in improvement
in boot up time.
If a PLMN-ID is to be included in the definition, enter the
plmnid
before entering the operator policy name.
plmnid
plmn_id
The 5-6 digit PLMN-ID consists of the MCC (mobile country code) plus
the MNC (mobile network code) to identify the public land mobile network (PLMN)
for a specific operator. This keyword associates a specific PLMN with this
specific SGSN operator policy.
plmn_id : Enter 5 to 6 digits.
+
This symbol indicates that command can be repeated to create repeated
definitions.
Usage Guidelines
An IMSI = maximum of 15 digits. An IMSI consists of the MCC (3 digits)
+ the MNC (2 or 3 digits) + the MSIN (the remaining 10 or 9 digits depending on
the length of the MNC ).
MCC and MNC are the minimum amount of information required to identify
a unique operator policy with IMSI filtering. The MCC and MNC combine uniquely
to identify the country and the network operator, for example: Cingular
Wireless in the United States =
mcc
311mnc
180
To improve the granularity of call handling, an operator policy with
additional IMSI filtering parameters can be defined, to include filtering based
on the MSIN, by defining a MSIN range - first (or start-of-range) MSIN and last
(or end-of-range) MSIN. The range numbers do not include the maximum allowed
for the MSIN but should include a sufficient number to enable the operator
policy to filter effectively.
For the most efficient IMSI filter, the operator policy should include
all of the above parameters and the PLMN ID which defines the current location
of the MS -- this parameter is particularly useful for highlighting which calls
are roaming.
And if none of the operator policies contain useful filtering
information, then the default operator policy will be applied as the
information in this command is never defined for the default operator policy.
The following table will illustrate how these filtering parameters
determine which operator policy will govern a call:
Operator Policy ID
|
MCC
|
MNC
|
MSINfirst
|
MSINlast
|
PLMN ID
|
OpPol-1
|
123
|
45
|
67890
|
67898
|
|
OpPol-2
|
123
|
45
|
|
|
|
OpPol-3
|
123
|
45
|
67890
|
67898
|
23232
|
OpPol-4
|
123
|
45
|
|
|
23232
|
OpPol-5
|
123
|
45
|
6789012
|
6789019
|
|
OpPol-6
|
123
|
45
|
6789012
|
6789019
|
23232
|
default
|
|
|
|
|
|
The filtering selects which operator policy will be used to determine
how a call is handled - the operator policy that best matches the IMSI. So, a
call with IMSI 123456789012345 PLMNID 23232 is best matched with OpPol-6.
In most cases, the operator policy with the most information defined
will be used as a combination of PLMNID and IMSI provides the best match. But
OpPol-6 won't always be the best match. Using the table above:
OpPol-1 is the best match for IMSI 123456789011111
OpPol-2 is the best match for IMSI 123456789099999
OpPol-5 is the best match for IMSI 123456789012345 if the PLMNID is
12344
Examples
The following associates operator policy
oppol1 with country code
310, mobile network code of
33, and IMSI range
1231234 - 1231244:
imsi-range mcc 310 mnc 33 msin first 1231234 last 1231244 operator-policy oppol1