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Sangoma Analog Voice Cards provide superior audio quality in their cards that are expandable from two to twenty-four ports in a 2U form factor.
The Sangoma A200 series has (4) RJ-11 connections per card while the Sangoma A400 Series is the high-density version of the popular A200 models with a robust DB25 connection.
For optimum echo-cancelled voice quality and enhancement choose the Sangoma Analog Voice Card models (A200D / A400D) with echo cancellation hardware. Sangoma analog cards guarantee error free faxing and click-free audio and there is no need for a separate analog line to run your fax machine.