Cisco Cisco Packet Data Gateway (PDG)
SGSN Changes in Release 16
SGSN Enhancements for 16.2 ▀
Release Change Reference, StarOS Release 16 ▄
475
CSCud55490, CSCup57547 - sm cause ‘Network Failure’ should not be sent in
Pri/Sec Act. rej.
Feature Changes
Gn-SGSN SM Cause Code Changes
The change of behavior involves the SGSN sending a different SM cause code in Activate Reject for the identified
scenarios; a cause code deemed more appropriate as the problem could be a temporary condition related to the GGSN
not being reachable.
scenarios; a cause code deemed more appropriate as the problem could be a temporary condition related to the GGSN
not being reachable.
Previous Behavior: SM cause code sent in specific scenario - please refer to table below.
New Behavior: Different SM cause codes to be sent for the specified scenarios - please refer to table below
Table 2. Changes of Gn-SGSN Cause Codes
Scenario
Old Code
New Code
CPC Response Timeout
activation rejected,
unspecified(31)
unspecified(31)
service option temporarily out of order(34)
DNS Response Failure
missing or unknown
APN(27)
APN(27)
activation rejected, unspecified(31)
CPC Response Failure with GTP cause "System
Failure"
Failure"
activation rejected,
unspecified(31)
unspecified(31)
activation rejected by GGSN, Serving GW
or PDN GW(30)
or PDN GW(30)
UPC Failure Response with GTP cause "System
Failure" for Direct Tunnel UPCQ
Failure" for Direct Tunnel UPCQ
activation rejected,
unspecified(31)
unspecified(31)
activation rejected by GGSN, Serving GW
or PDN GW(30)
or PDN GW(30)
CSCuj33259 - Attach not processed when ISRAU is in progress
Feature Changes
Handling of foreign PTMSI
Previous Behavior: If foreign PTMSI attach arrives when the GTP response is in pending state, the attach is not being
honored.
honored.
New Behavior: If foreign PTMSI attach arrives when the GTP response is in pending state, an Identity request will be
triggered towards the MS to obtain the IMSI.
triggered towards the MS to obtain the IMSI.