The Sangoma Vega VS0082 1x3 DSP Card is the modular add-in card that allows you to use the 4th built in T1/E1 port on the Vega 400 Gateway. Gateways that are sold with 120 channels already have this card built in.
The Sangoma Vega LC0102 channel license allows you to enable an additional VoIP Channel on your Vega 400 while in the field. The Vega 400 Channel License plus additional DSP cards makes Vega 400 a modular and field upgradeable solution
The Audiocodes M1KB-SWX is a 4 ports LAN switching extension module for 2 Active/Standby pairs of GE interfaces (for a total of 3 Active/Standby pairs of GE interfaces on Mediant 1000B. It is only compatible only with Mediant 1000B chassis.