The SPA3102 has all of the same capabilities as the SPA 2102 and more. The SPA-3102 lets you connect standard telephones and fax machines to IP-based data networks with the additional benefit of legacy telephone network integration. The SPA2102 and SPA3102 both support up to 2 sessions using G.729 but the SPA3102 also supports 2 incoming services (proxy registrations) and an unlimited number of outgoing VoIP services. These added benefits make the SPA3102 a must buy if you’re integrating your hosted VoIP service with a legacy system or need more flexibility with your outgoing service.
Offers the same capabilities as the SPA 2102 and more
Allows for integration with legacy telephone networks
Supports 2 incoming services
Supports unlimited number of outgoing VoIP services