UNE-ETS 300921 Ed1:2005 Digital cellular telecommunications system; Service accessibility (GSM 02.11 version 5.0.1) (Endorsed by AENOR in October of 2005.)
2005UNE-ETS 300921 Ed1:2005 Digital cellular telecommunications system; Service accessibility (GSM 02.11 version 5.0.1) (Endorsed by AENOR in October of 2005.)