This phone can be seamlessly integrated with all major UC platforms and existing IT investments. Video conferencing accessories can be easily attached to make your meetings visual and give you ultimate flexibility. The VVX 600 can also handle up to 24 simultaneous calls making it ideal for today's workers handling a low to moderate volume of calls. The Polycom VVX500 is powered by PoE and does not come with a PSU, this is available to purchase separately