The KSW1500 scales coverage further and a single unit can support up to 64 wireless handsets, if needed this can be increased to 128 by linking two units through a KIRK link card. If the link card is deployed together with other expansion features it can accomodate wireless users of anywhere between 128 and 700. The KSW 1500 connects easily to most analogue station ports through the host PBX. The KSW1500 allows for a text messaging option and suits businesses with a large number of onsite employees.