UNE-ETS 300953 Ed1:2005 Digital cellular telecommunications system; Call Waiting (CW) and Call Hold (HOLD) supplementary services; Stage 3 (GSM 04.83 version 5.0.1) (Endorsed by AENOR in November of 2005.)
2005UNE-ETS 300953 Ed1:2005 Digital cellular telecommunications system; Call Waiting (CW) and Call Hold (HOLD) supplementary services; Stage 3 (GSM 04.83 version 5.0.1) (Endorsed by AENOR in November of 2005.)