The VPMOCT256 provides the G.168 algorithm which has been labeled a benchmark for echo cancellation and performs 128ms (1024 taps) of echo cancellation across all 240 channels in E1 mode or all 192 channels in T1/J1 modes.
This module is suitable for Digium 8-port T1/E1 cards. For quad port cards, see the VPMOCT128. For dual port cards, see the VPMOCT064. For analog and single port T1/E1 cards, please see the VPMADT032.