License to upgrade NEC EdgeMarc 4300T(750482) additional 8 ports, maximum up to 24 ports. Up to 2 license upgrades can be installed, bringing the capacity to 24 ports. Each license port represents the number of simultaneous calls that are insured voice priority resulting in the highest possible quality. Calls exceeding the number of licensed calls will be processed, however they will not be issued high priority status therefore quality loss may occur.