Digium 1TE436F is a half length, low profile PCI card with four digital T1 ports. This is a state-of-the-art solution for migrating T1 connections to IP-based telephony. Applications include phone systems, VoIP services, conferencing and VoIP gateways.Deploy the Digium TE436F card with Asterisk-based phone systems. The card can support up to 96 concurrent calls in T1 mode.