The TE412P (3.3 Volt) combines the TE410P card and the VPM450M Octasic DSP-based echo cancellation module. The VPM450M provides a certified carrier-grade algorithm noted as a benchmark for echo cancelation. The VPM450M improves upon the older VPM400M and TE411P/TE406P products.

Previously, with the VPM400M, 16ms or 128taps of echo cancellation were possible across 128 channels. The VPM450M eliminates echo tails up to 128ms or 1024 taps across all 128 channels in E1 mode or 96 channels in T1/J1 modes. This module also takes advantage of the Octasic Voice Quality Enhancement to provide superior quality of sound on all calls.

The TE 412P is fully integrated with the Asterisk PBX/IVR and Digium has designed the TE412P to be fully compatible with existing software applications. The open source driver also supports an API interface for custom-made applications.

The TE412P adheres to industry standard telephony and data protocols, including Primary Rate ISDN (N. American and Standard Euro) protocol families for voice, Cisco, PPP, HDLC, and Frame Relay data modes. Both line-side and trunk-side interfaces are supported, as well as advanced call features. The TE412P is for use only with a 3.3 volt PCI slot.