The Switches can be stacked up to eight units high[1] through a 'stacking' configuration; Avaya markets this capability under the term 'Avaya Virtual Enterprise Network Architecture (VENA) Stackable Chassis'.

[7][8] In 2008 Layer 3 routing support, secure web access with https and TACACS+ were added to the software in version 4.2.

[10][11] In May 2009 Cisco published an evaluation and comparison between this switch and its 2000 and 3000 series switches as competitor published fear, uncertainty and doubt about the product not having the ability to do routing, even after the product had released the new routing software almost a year earlier.

The Switch leverages 802.1AB link layer discovery protocol and LLDP media endpoint discover and auto discovery and auto configuration to allow the Switch to automatically configure or reconfigure itself for new phone installs or phone movement in 1 minute.

The bi-directional paths allow the traffic to automatically redirect around any switch in the stack that is not operating properly.

[21] This stacking technology allows stackable switches to operate with the same performance and resiliency as chassis solution.