The Digium 1TE436BF card features the VPM128 echo cancellation module. The module brings hardware-based echo cancellation to the card for enhancing overall audio quality in voice communications. This card also features four T1 ports, a PCI interface and a low profile, half length form factor. Migrate from T1 to VoIP with this high performance digital telephony card. Install the card with Asterisk-based platforms. Applications for the Digium TE436BF card include phone systems, VoIP services, conferencing and VoIP gateways. Support up to 96 concurrent calls in T1 mode.