Cisco Cisco ASR 5700 Guide De Dépannage

Contributed by Karuna Jha and Azgar Shaik, Cisco TAC Engineers.
Sep 01, 2015

This document describes a problem that is encountered on the Cisco Aggregated Services Router (ASR) 5x00
Series that acts as a Serving General Packet Radio Service (GPRS) Support Node (SGSN) after a subscriber
moves from one Public land Mobile Network (PLMN) to another PLMN within the same SGSN, or between
two SGSNs.

The expected behavior is that the SGSN should perform a Routing Area Update (RAU) reject, and that the
User Equipment (UE) should perform a fresh attach in the new PLMN. However, this is not the case in some
instances. A workaround to this problem is provided.

Here is the call flow when a UE moves from its home PLMN to a foreign PLMN:

Once the call arrives at the SGSN, the SGSN checks the operator policy name against the
International Mobile Subscriber Identity (IMSI):

sgsn-global

    imsi-range mcc xxx mnc yyy operator-policy

     <operator_policy_name>

1. 

The associated call-control profile is checked against the operator policy:

operator-policy name <operator_policy_name>

    associate call-control-profile

     <call_control_profile_name>

 #exit

2. 

After the call-control profile is checked, the UE behaves as per the configuration:

call-control-profile < call_control_profile_name>

    rau-inter-plmn restrict access-type gprs all

    rau-inter-plmn access-type gprs all failure-code 14

3.