Avaya 4621SW IP business phone, with the built-in infrared (IrDA) port, you can communicate with and command the phone to dial numbers using a personal digital assistant (PDA) or other infrared equipped device. Directional microphone and a tuned speaker cavity will provide reduced distortion and optimized voice quality for clearer calls. The Avaya 4621SW IP Phone has a large capacity LAN connection for large data transfer. They connect to your IP network by a single 10/100baseT Ethernet LAN connection. An Ethernet connection built into each phone enables you to connect a desktop computer to your LAN by plugging it directly into the phone, without needing a separate computer connection in the wall. It will automatically obtain an IP address. The Avaya 4620IP Telephone allows power to be supplied through several alternative methods: A local external power supply with power through a Special Jack, Bulk Power from the closet on spare Pins 7&8 with either an Avaya proprietary or IEEE standard supply, or from the data switch over the Ethernet signal pairs.