COMMEND, GE300 Licence: Upgrade G3-GED-4B to G3-GED-4D

G3-GED-4B:
DSP subscriber card for connection of up to four 2-wire digital subscribers. Up to five G3-GED cards can be used with a GE 300 IP intercom server, as well as five additional ones in Expansion Central GEZ 300. One call per subscriber is possible at the same time (non-blocking).

L3-GED-4C: Licence for feature level C
L3-GED-4D: Licence for feature level D 
L3-GED-4P: Licence for feature level P