Panasonic kx-tde0110 voip dsp card has 16-channel ip trunk & amp; amp; amp; 32-channel ip proprietary telephone activation keys preinstalled, but is expandable up to 32 ip trunks and 64 ip phones with proper keycodes kx-tde0111 specs: -ability to add sip trunks with allows you to add sip extensions for phones like the polycom soundpoint ip phones -ability to add gateway trunks to network multiple locations -ability to add panasonic ip phones such as the kx-nt321, kx-nt343, kx-nt346, kx-nt366 -compliant w/ itu-t g.729A, g.711A, & g.722 Codec methods this card attaches to the mpr