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Digium VPM64 - Sixty-four (64) Channel Hardware Echo Cancellation Module
Digium VPM128 - One Hundred and Twenty-Eight (128) Channel Hardware Echo Cancellation Module
Digium TC400B - VoIP Transcoding PCI 3.3/5.0V card for 120 G.729a or 92 mixed channels of G.729a/G.723.1