What is the difference between our analog and digital Voip models?

The analog models have between 1&8 physical voice ports that can be connected to analog line ports, analog station ports, or analog E&M ports (not all analog models support all options).

The digital models don't have separate physical connections for each channel. Instead, they are designed to connect directly to a telco T1/E1 lines, or to a T1/E1 cards in a PBX.