Panasonic kx-ns5110, a dsp card is a digital signal processor card with dsp resources that can be used for voip calls, conferences, the unified messaging feature (voice-mail and auto attendant), and the disa/ogm feature. The dsp cards are compliant with itu-t g.729a and g.711 codec methods.
Depending on the amount of your dsp resource needs, dsp s, dsp m, or dsp l cards can be installed. The number of resources provided by each type of dsp card is as follows:
dsp s card: 63
dsp m card: 127
dsp l card: 254