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Calculating needed DSP resources

Hi,

I need some advice on how to accurately choose how much DSP resources I need when buying 2800 series integrated services routers.

If I go with say 32 channels, does that mean it will support 32 concurrent voice calls. Also, if i'm running a WAN link out of the router instead of say a E1 connection do I still need all the DSP resources since it isn't converting to G711 here?

Thanks in advance,

Bo

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