The Avaya 46xx Series IP Telephones deliver an extensive set of software features, high audio quality, and attractive streamlined design. Avaya 46xx Series IP Telephones are simple to use with both fixed and flexible feature buttons, easy-to-read graphics including back lighting and color displays on some models, and several wall mount and desk mount options. They have been optimized for reliable use in IP networks, with sophisticated security capabilities such as media encryption and protection from denial of service attacks. Built-in Ethernet switch ports enable streamlined desktop implementations, while voice packets are tagged with the appropriate quality of service (QoS) parameters such as 802.1q and DiffServ for priority treatment by QoS-enabled IP networks. The 4600 Series IP Telephones also support the 802.3af power over Ethernet standard.

The 4621SW IP Telephone is based on the 4620SW with the same housing, feature buttons and software along with an enhanced backlit display. The 4621SW also supports the new EU24BL (backlit expansion module) and also includes a 2-port Ethernet switch.

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