TMGI-Expiry AVP ( 3515 )
The TMGI-Expiry AVP is used by the Broadcast-Multicast Service Centre (BMSC) to notify the Group Communication Service (GCS) AS about the expiry of Temporary Mobile Group Identities (TMGIs), and shall include all TMGIs that have expired.
Reference: 3GPP TS 29.468-f40
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