H
ELECTRICITY
H
ELECTRICITY
H04
ELECTRIC COMMUNICATION TECHNIQUE
H04
ELECTRIC COMMUNICATION TECHNIQUE
H04W
WIRELESS COMMUNICATION NETWORKS
H04W
WIRELESS COMMUNICATION NETWORKS
H04W4/00
Services specially adapted for wireless communication networks; Facilities therefor
H04W4/00
Services specially adapted for wireless communication networks; Facilities therefor
H04W4/16
Communication-related supplementary services, e.g. call-transfer or call-hold
H04W4/16
Communication-related supplementary services, e.g. call-transfer or call-hold