32 ports VoIP GSM Gateway / VoIP GSM/UMTS/LTE Gateway (from 16 to 32 GSM channels)
16 ports VoIP GSM Gateway / VoIP GSM/UMTS Gateway (from 16 to 32 GSM channels)
8 Channels VoIP GSM/CDMA/UMTS Gateway
4 Channels VoIP GSM/CDMA/UMTS Gateway
1 Port VoIP GSM Gateway/VoIP UMTS Gateway/4G LTE Gateway