Editing My 33.127 Notes (section)

==== 5.7.2.3	Identity Caching Function (ICF) ====
The ICF is the LI function responsible for caching of identifier associations provided by the IEF in event records received over the LI_XER and answering queries from the IQF received over LI_XQR. The ICF shall support association queries from both temporary identities to permanent identities and from permanent identities to temporary identities.

The ICF shall store identifier associations received from the IEF and hold them indefinitely as active associations until:
* A new association event is received which updates a previous association.
* A disassociation event is received for a stored association.
* A CSP defined maximum age is reached.

Upon receiving a disassociation event or a new association event from the IEF, the ICF shall match any corresponding identifier associations, mark them for deletion and begin the cache time for that association. After being marked for deletion, associations shall be deleted and purged irrecoverably from the ICF once their cache time limit is reached.

:NOTE:	The cache time limit after which automatic deletion should occur is outside the scope of the present document. However, this CSP determined value needs to be no shorter than the maximum allowed query delay (i.e., the time from the identity observation by the LEA to the query reception by the CSP). Otherwise, this value needs to be as short as possible.

The ICF shall support both query and response types as defined in clause 5.7.1. For the on-going triggered response query type, after sending the initial response, the ICF shall send a further response each time the permanent identifier provided in the initial query is associated or de-associated with a temporary identifier until the IQF deprovisions the query in the ICF.

The ICF shall support immediate deletion of identifier associations received in events for one or more IEF(s) when requested to do so by the LICF (proxied by the LIPF) over LI_XEM1.