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Feature #4374

send GSUP PurgeMS Request (CN-Domain = CS) to the HLR upon IMSI-Detach

Added by neels about 1 month ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
-
Target version:
-
Start date:
01/23/2020
Due date:
% Done:

0%

Resolution:

Description

OsmoSGSN sends a GSUP PurgeMS Request to the HLR when a subscriber detaches (with CN-Domain = PS).
OsmoMSC does not send such a message.

But: this could instead be a message that should be sent to a previous MSC/SGSN upon an attach on a new MSC/SGSN.
Make sure beyond doubt that sending PurgeMS is the proper thing to do for IMSI Detach;
If not, reject this issue and add an OsmoSGSN one to fix OsmoSGSN's PurgeMS behavior.

If it is correct to send PurgeMS, make OsmoMSC also send this message with CN-Domain = CS.
Figure out whether to send a PurgeMS only for explicit IMSI Detach, or also for implicit detach due to periodic LU timeout.
For completeness' sake also check/match up OsmoSGSN's behavior for implicit detach.

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