Number of
Telephony
Ports
Max Number of
Simultaneous Calls
Telephony
interfaces
Gateway
or
Router
1 or 4 15 to 120
software upgradeable T1/E1/PRI Router
up to 16 120 T1/E1/PRI
FXS, BRI Gateway/Router
From 1 to 32 ports for analogFXS or FXO IP connectivityThe most comprehensiveBRI VoIP solutions on the planetHigh-capacity trunk solutionsDo-anythingVoIP boxes1
1 or 2
2 to 8
1 or 2
2 to 8
2 to 8
2
up to 32
1
2
3 / 5
3 / 5
4 to 16
2
2
8
4
8
8
2
up to 32
2
2 / 4
4 / 8
4 / 8
32
FXS
FXS
FXS and FXO
FXS
FXS and FXO
FXS and FXO
FXS
FXS
BRI So
BRI So
BRI So
BRI So
BRI So
Gateway
Router
Gateway
Router
Router
Router
Wireless Router
Router
Gateway
Router
Router
Router
Router