KTA9600 serials voip gateway has:

   Model                               Description
KTA9600-96S-C        96FXS, 24 simultaneous calls
KTA9600-96S-D        96FXS, 48 simultaneous calls
KTA9600-96S-E        96FXS, 72 simultaneous calls
KTA9600-96S-F        96FXS, 96 simultaneous calls
KTA9600-72S-C        72FXS, 24 simultaneous calls
KTA9600-72S-D        72FXS, 48 simultaneous calls
KTA9600-72S-E        72FXS, 72 simultaneous calls
KTA9600-48S-C        48FXS, 24 simultaneous calls
KTA9600-48S-D        48FXS, 48 simultaneous calls
KTA9600-96FXO-C     96FXO, 24 simultaneous calls
KTA9600-96FXO-D     96FXO, 48 simultaneous calls
KTA9600-96FXO-E     96FXO, 72 simultaneous calls
KTA9600-96FXO-F     96FXO, 96 simultaneous calls
KTA9600-72FXO-C     72FXO, 24 simultaneous calls
KTA9600-72FXO-D     72FXO, 48 simultaneous calls
KTA9600-72FXO-E     72FXO, 72 simultaneous calls
KTA9600-48FXO-C     48FXO, 24 simultaneous calls
KTA9600-48FXO-D     48FXO, 48 simultaneous calls