Cisco ATA 191 2-Port Analog Multiplatform VoIP Telephone Adapter

CiscoSKU: ATA191-3PW-K9


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Cisco ATA 191 2-Port Analog Multiplatform VoIP Telephone Adapter

SKU: ATA191-3PW-K9



The Cisco ATA 191 Analog Telephone Adapter is a 2-port handset-to-Ethernet adapter that brings traditional analog telephony devices into the IP world.

Product overview

The Cisco® ATA 191 Analog Telephone Adapter turns traditional telephone, fax, and overhead paging communications devices into IP devices for greater cost-effectiveness. Customers can take advantage of IP telephony applications by connecting their analog devices to Cisco analog telephone adapters.

The Cisco ATA 191 Analog Telephone Adapter is the preferred solution to address the needs of customers who connect to enterprise networks, small offices, or the emerging unified communications as a service from the cloud. It has two standard FXS ports, which can be configured independently as two Session Initiation Protocol (SIP) registrations. With the ATA 191, customers can protect and extend their existing investment in analog systems, as well as smooth their migration to pure voice over IP in an affordable and reliable way.

Features and benefits



Voice quality

Offers clear, natural-sounding voice quality via advanced preprocessing, high-performance echo cancellation, Voice Activity Detection (VAD), and Comfort Noise Generation (CNG)

Central provisioning and configuration

Eases deployment via a Cisco Unified Communications Manager central interface


Provides a complete security solution for both media and signaling

Problem reporting (PRT)

Improves serviceability with a dedicated PRT button for problem reporting and log collection


Enables an IPv4/IPv6 dual stack to help migration to IPv6


Platform Support

The Cisco ATA 191 Analog Telephone Adapter is compatible with Cisco call control systems (CUCM, CME).


Phone licensing depends on the call control platform and its policies. For Cisco Unified Communications Manager, the Cisco ATA 191 Analog Telephone Adapter requires one Essential User Connect License (UCL) per port.

Product specifications



Physical dimensions (H×W×D)

3.9 x 3.9 x 1 in. (100 × 100 × 28 mm)


4.7 oz (132.1 g)


Interface: Two RJ11 FXS ports, one 10/100 Mbps RJ-45 Ethernet port

Button: Reset / Problem Reporting (PRT)

LED indicators: Power, Network, Phone 1, Phone 2, PRT

Wall mountable

Subscriber Line Interface Circuit (SLIC)

Ring voltage: 40 to 90 Vpk configurable

Ring frequency accuracy: 1%

Ring waveform: Trapezoidal or sinusoidal

Maximum ringer load: 3 Ringer Equivalence Numbers (RENs)

On-hook voltage (tip and ring): -46 to -56V

Off-hook current: 25mA +/-10%

Terminating impedance: 600 ohm resistive, 900 ohm resistive, or 220 ohm + 820 ohm

120 nF complex impedance

Frequency response: 300 to 3400 Hz

Return loss (600 ohm, 300 to 3400 Hz): up to 26 dB

Idle channel noise: <-65 dBm 0p

Longitudinal balance: 58 dB (typical)

Voice quality Mean Opinion Score (MOS): >4.0

Voice quality jitter: <150ms


MAC address

IPv4 only

IPv6 only

IPv4/IPv6 dual stack

Session Initiation Protocol (SIP)

Transmission Control Protocol (TCP)

User Datagram Protocol (UDP)

Real Time Protocol (RTP)

Real Time Control Protocol (RTCP)



Trivial File Transfer Protocol (TFTP)

Address Resolution Protocol (ARP)

DNS A and AAAA records

Dynamic Host Configuration Protocol (DHCP) client

Internet Control Message Protocol (ICMP)

Simple Network Time Protocol (SNTP)

Cisco Discovery Protocol (CDP)

Link Layer Discovery Protocol (LLDP)

Quality of Service (QoS)

IEEE 802.1p/Q (QoS and VLAN tagging)

Differentiated Services (DiffServ) / Type of Service (ToS)


Call forwarding: No answer, busy, and all

Call hold and resume

Caller ID generation (name and number): Bellcore, BT, and European Telecommunications Standards Institute (ETSI)

Caller ID with name and number

Call pickup and group pickup

Call transfer

Call waiting


Configurable ring frequency

Country-specific tones and cadences

Disconnect tone

Distinctive ringing: Calling and called number

Forced Authorization Code (FAC)/Client Matter Code (CMC)

Failover and fall back

Flash hook timer

Hook flash event signaling

Hotline and warm line calling

Message Waiting Indicator (MWI) tones

Music on hold

Off-hook warning tone

Polarity control


Share lines

Speed dial

Tip and ring voltage adjustment setting

Visual Messaging Waiting Indicator (VMWI) using Frequency Shift Keying (FSK)


Codec: G.711 a-law, G.711 μ-law, G.729a, G.729ab

Full duplex audio

Echo cancellation

Voice activity detection

Silence suppression

Comfort noise generation

Adaptive jitter buffer

Frame loss concealment

Adjustable audio frames per packet

Call progress tone generation

Impedance and gain adjustment

Dynamic audio payload

Fax and modem

Real-time fax over IP via T.38 fax relay (Group 3)

Fax pass-through via G.711 (Group 3)

Fax tone detection and pass-through

Auto negotiation on transmission rate

Provisioning and management

Central configuration

Interactive Voice Response (IVR)

Automated provisioning and upgrading via HTTP and TFTP

SSH access

Nonintrusive, in-service upgrades

Report generation and event logging

Dedicate PRT button

Support RTP statistics

Syslog (multilevel granularity)

Dual image


System reset to factory default

Password-protected administrator access authority

Provisioning, configuration, and authentication

HTTPS with factory-installed client certificate

Advanced Encryption Standard (AES) encryption

SIP over Transport Layer Security (TLS) 1.1 and 1.2

Secure (encrypted) calling using Secure RTP (sRTP)

Encrypted TFTP configuration files

Image authentication

Secure boot

Secure Shell (SSH)


DC input voltage: 5V DC at 2.4A maximum

Power consumption: 5W

Switching type (100 to 240V) automatic

Power adapter: 100 to 240V and 50 to 60 Hz (26 to 34 VA) AC input, with 6-ft (1.8-m) cord


Mean Time Between Failures (MTBF): 300,000 hours

Operating temperature: 32° to 104°F (0° to 40°C)

Nonoperating temperature: 14° to 140°F (-10° to 60°C)

Humidity: Operating 10% to 90%, noncondensing; nonoperating 10% to 95%, noncondensing

Compliance (regulatory)

CE markings per directives 2014/30/EU and 2014/35/EU

Compliance (safety)

UL 60950 Second Edition

CAN/CSA-C22.2 No. 60950 Second Edition

IEC 60950-1:2005 (Second Edition) + A1:2009 + A2:2013 and/or AS/NZS 60950.1:2015

Compliance (EMC)

AS/NZS CISPR 32:2015 Class B

CISPR 32: 2015 Class B

EN 55032: 2015 Class B

EN 61000-3-2: 2014 Class A

EN 61000-3-3: 2013

EN 55024:2010+A1: 2015

EN 61000-4-2: 2009

EN 61000-4-3: 2006+A1:2008+A2:2010

EN 61000-4-4: 2012

EN 61000-4-5: 2014

EN 61000-4-6: 2014+AC2015

EN 61000-4-8: 2010

EN 61000-4-11: 2004

FCC Part 15, Subpart B

ANSI C63.4-2014

ICES-003 Issue 6: 2016

ANSI C63.4-2014


CISPR 32: 2015 class B


Warranty information

The Cisco ATA 191 Analog Telephone Adapter is covered by a 1-year limited hardware warranty.

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