Communications by mobile phones; Digital network telecommunications services; Mobile radio communication; Providing voice communication services via the Internet; Radio communications; Transmission and delivery of push-to-talk communications via the internet; Wireless electronic transmission of push-to-talk communications

'communic':1,11,14,20,29,41 'deliveri':23 'digit':5 'electron':34 'internet':18,32 'mobil':3,9 'network':6 'phone':4 'provid':12 'push':26,38 'push-to-talk':25,37 'radio':10,19 'servic':8,15 'talk':28,40 'telecommun':7 'transmiss':21,35 'via':16,30 'voic':13 'wireless':33

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