The VPMADT032 is Digium's latest, and most powerful to date, echo cancellation module for the TDM800P and the TDM2400P series analog cards. Future Digium card models will also likely be compatible with this module. Digium designed the new VPMADT032 to offers industrial strength 128ms(1024 taps) per-channel echo cancellation across all channels on the TDM card.

The VPMADT032 provides toll-quality G.168 compliant echo cancellation to combat hybrid echo on the PSTN interface.

Though there are open source echo cancellation routines that are somewhat effective in eliminating this hybrid type echo, the VPMADT032 module resolves this problem in hardware, mitigating any negative effect CPU resource shortages may induce on an otherwise purely software based echo cancellation solution.