The Cisco IAD2430 series IADs aggregate multiple channels of data and voice or fax user-side traffic for transport over single or multiple WAN uplinks. Voice or fax traffic is transported by VoIP or by Voice over Asynchronous Transfer Mode (VoATM). All platforms support Media Gateway Control Protocol (MGCP), the signaling protocol H.323, and Session Initiation Protocol (SIP).

The Cisco IAD2430, Cisco IAD2431, and Cisco IAD2432 series routers consist of five models with a common front panel (Figure 1). The Cisco IAD2435 series router consists of one model (Cisco IAD2435-8FXS) with a different front panel (Figure 2). The Cisco IAD2430, Cisco IAD2431, and Cisco IAD2432 series routers include a slot for the external flash memory card, as well as console, auxiliary, and flash (CF) memory ports. The front panel, labeled "Cisco IAD2400 Series," is identical for all models. However, the back panels, labeled by specific model number, vary considerably, depending on interfaces, ports, and options. Analog voice ports use an RJ-21 interface. 

The Cisco IAD2431-16FXS IAD provides sixteen analog FXS ports with two 10/100BASE-T ports and two T1/E1 WAN ports. The chassis has the following interfaces:RJ-21 analog voice interface,One T1/E1 port.Two 10/100BASE-T ports,One WIC/VIC slot,External flash memory,AC and DC power inputs