Echo Cancellation Modules Digium

For Asterisk users connecting to the PSTN, echo with the voice communication is possible and can be managed effectively with echo cancellation modules from Digium. Asterisk has a range of software-based Open Source echo cancellation routines that are moderately effective in eliminating the echo that most Asterisk users experience. However, there are cases in which these algorithms are not effective. To combat this, Digium offers a line of DSP-based echo cancellation modules for all the Digium analog and digital (T1/E1/J1) cards with the VPMOCT series modules.

Compatibility

The modules and the Digium telephony cards they support are as follows:

VPMOCT256

Up to 256 channels
Compatible with the following Digital card:

• TE820F (bundled as TE820BF)

VPM128

Up to 128 channels
Compatible with the following Digital cards:

• 4-port TE435 (bundled as 1TE435BF)
• 4-port TE436 (bundled as 1TE436BF)

VPMOCT128

Up to 128 channels
Compatible with the following Digital cards:

• TE405PF (bundled as TE407PF)
• TE410PF (bundled as TE412PF)
• TE420F (bundled as TE420BF)

VPM064

Up to 64 channels
Compatible with the following Digital cards:

• 2-port TE235 (bundled as 1TE235BF)
• 2-port TE236 (bundled as 1TE236BF)

VPMOCT064

Up to 64 channels
Compatible with the following Digital cards:

• TE205PF (bundled as TE207PF)
• TE210PF (bundled as TE212PF)
• TE220F (bundled as TE220BF)

VPM032

Up to 32 channels
Compatible with the following Analog cards:

• 4-port A4A
• 4-port A4B
• 8-port A8A
• 8-port A8B

VPMOCT032

Up to 32 channels
Compatible with the following Analog cards:

• 4-port TDM410
• 4-port AEX410
• 8-port TDM800P
• 8-port AEX800
• 24-port TDM2400P
• 24-port AEX2400

Compatible with the following Digital cards:

• 1-port TE121
• 1-port TE122