spec: elaborate on how optional this is
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@ -192,7 +192,9 @@ next SMS. Afterwards, the EF~IMSI~ changing procedure in 3GPP TS 11.14, Section
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=== Process Update_Location_HLR
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All IMSI Pseudonymization related changes to Process Update_Location_HLR
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(3GPP TS 29.002) are optional.
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(3GPP TS 29.002) are optional. All deviations from the existing specification
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that are outlined in this section are expected to be enabled or disabled
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entirely where IMSI pseudonymization is implemented.
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* HLR looks up subscriber by pseudonymous imsi in Update Location Request
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* if two pseudo imsi found, and connected with new one: dealloc old entry
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