GXW4501 Digital VoIP Gateway features 1 T1/E1/J1 span and supports 30 concurrent calls
NeoGate TE100 - VoIP PRI Gateway(PRI-VoIP) - 1 PRI E1/T1 port
GXW4502 Digital VoIP Gateway features 2 T1/E1/J1 span and supports 60 concurrent calls
Neogate TE200 - VoIP PRI Gateway (PRI-VoIP) - 2 PRI E1/T1 ports