Asterisk Software Add-ons

Find popular add-ons and more to extend the power of any Asterisk open source configuration.

High Performance Echo Cancellation
for Asterisk (HPEC)

For Asterisk users that connect to the PSTN, the most common type of echo is hybrid echo - the echo introduced by the impedance mismatch between 2-wire and 4-wire telephone circuits. The echo manifests as a distorted and delayed reflection of the users voice while in conversation with an external party through the PSTN. HPEC Toll-Quality echo cancellation software is designed to operate under 32-bit and 64-bit Linux on x86-32 and x86-64 compatible processors, and provides echo cancellation for configurable tail lengths of 16ms (128 taps), 32ms (256 taps), 64ms (512 taps), and 128ms (1024 taps).

HPEC software canceller requires only a moderate amount of CPU time / MIPS in order to effectively regulate echo. Digium recommends that users requiring 8 channels at 1024 taps run a PC comparible to a 3.0 GHz Pentium 4, while users only requiring 4 channels at 1024 taps may run a 2.5 GHz Pentium Celeron. The CPU requirements are such that it is impractical to operate this echo canceller at 1024 taps for a full T1 or E1 of channels.

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Echo Cancellation Phone Graphic

Call to ActionFor hardware echo cancellation, Digium provides DSP-based echo cancellation modules for all T1/E1/J1, analog and BRI/Hybrid card models. Learn More

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