Enhanced BLF (Busy Lamp Field)- View a phone status (onhook, offhook, ringing, connected) on the 480i large 8-line backlit display. Go even further with presence information (out to lunch, busy, DND and more) 4 call Appearance Lights - Juggle up to 4 calls at the touch of a button. Place callers on hold automatically as you jump between calls Remarkable Audio - Quality speaker phone with excellent voice delivery. Intercom ability allows set paging within the office. Multiple Protocol Support - Tightly integrated to work with a wide variety of IP telephony systems Protect Your Investments - Firmware upgrades can be installed in the field as standards develop and protocols evolve Less Wiring - Built in two-port 10/100 Ethernet switch lets you share a connection with your computer. Inline power support eliminates power adapters. LEARN MORE: [PDF Document - Adobe Acrobat Required] Aastra Announces SIP Software Release 1.4 for Enterprise IP Telephones [PDF Document - Adobe Acrobat Required] Directions on Upgrading Firmware on Aastra Telecom IP Phone