Management guide for the Cisco ATA 191 analog telephone adapter, covering installation, configuration, security, fax, and troubleshooting.
The Cisco ATA 191 is a compact analog telephone adapter that lets standard analog phones operate on an IP‑based telephone network. It provides two independent voice ports, a RJ‑45 10/100BASE‑T Ethernet port, and power via a 5 VDC adapter.
This management guide explains how to install the ATA191, configure SIP and security settings, set up fax and IVR options, and troubleshoot common issues. It also includes detailed hardware specifications, regulatory compliance information, and country‑specific tone configuration procedures.
| DC input voltage | 5 VDC at 2.0 A |
|---|---|
| Maximum power consumption | 5 W |
| Power adapter input | 100‑240 V, 50‑60 Hz |
| Physical dimensions | 3.98 × 3.98 × 1.10 in (101 × 101 × 28 mm) |
| Weight | 5.40 oz (153 g) |
| Voice ports | 2 RJ‑11 FXS ports |
| Network port | 1 RJ‑45 10/100BASE‑T Ethernet port |
| Ringing voltage per port | 70 VRMS typical balanced ringing |
| Ringing load | 1400 Ω + 40 µF |
The ATA191 supports two voice ports, each with its own telephone number.
It includes one RJ‑45 10/100BASE‑T Ethernet port for data connectivity.
The device operates from a 5 VDC supply at up to 2.0 A and draws a maximum of 5 W.
Each port provides a typical balanced ringing voltage of 70 VRMS.