{"id":6299,"number":"25.852","type":"TR","title":"Iu enhancements for IP Multimedia (IMS) support in UTRAN","series":25,"status":"Withdrawn before change control","initial_release":"Rel-4","primary_group":"R3","secondary_groups":[],"portal_id":1285,"portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1285","dynareport_url":"https://www.3gpp.org/dynareport/25852.htm","publication_scope":null,"radio_technologies":[],"first_seen_at":"2026-09-16T11:04:52.956817+00:00","updated_at":"2026-10-16T09:34:55.609033+00:00","raw_metadata":{"source_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1285","bibliography_source":"ftp://ftp.3gpp.org/Information/Databases/3GPPBibliography.csv"},"detail_synced_at":"2026-10-08T00:04:16.882446+00:00","versions":[{"release":"Rel-4","version":"0.1.2","meeting":"-","upload_date":"2003-11-12","comment":"R3-031545","official_file_url":"https://www.3gpp.org/ftp/Specs/archive/25_series/25.852/25852-012.zip","source_url":"ftp://ftp.3gpp.org/Information/Databases/3GPPBibliography.csv","portal_version_id":null,"version_status":"pre-approval"},{"release":"Rel-4","version":"0.0.0","meeting":"RAN-#11","upload_date":"2001-04-06","comment":"","official_file_url":"https://www.3gpp.org/ftp/Specs/archive/25_series/25.852/25852-000.zip","source_url":"ftp://ftp.3gpp.org/Information/Databases/3GPPBibliography.csv","portal_version_id":null,"version_status":"pre-approval"}],"release_presence":[{"release":"Rel-4","first_version_date":"2001-04-06","latest_version_date":"2003-11-12","first_version":"0.0.0","latest_version":"0.1.2","version_count":2}],"classifications":[],"work_items":[],"change_requests":[],"relationships":[],"relationship_release_evidence_summary":[],"relationship_release_evidence":[],"relationship_release_evidence_meta":{"total":0,"returned_count":0,"limit":100,"truncated":false,"href":"/api/specs/25.852/relationship-evidence"}}