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ETSI ETR 111
- Digital cellular telecommunications system (Phase 2) (GSM); Interworking between Phase 1 infrastructure and Phase 2 Mobile Stations (MS) (GSM 09.90 version 4.9.0)
- standard by European Telecommunications Standards Institute, 10/01/1997
- Publisher: ETSI
$11.00$21.51
Introduction of EFR in GSM phase 2 specifications Inclusion of Keypad facility element in Start DTMF Acknowledge message