Cisco ATA 191 Multiplatform Analog Telephone Adapter Data Sheet

Data Sheet

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Updated:September 3, 2021

Bias-Free Language

The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.

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Updated:September 3, 2021


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

Product overview

The Cisco ATA 191 Multiplatform 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 ATA 191 is the preferred solution to address the needs of customers who connect to enterprise networks, small offices, or 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 a more 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, and comfort noise generation

Cloud provisioning

Enables zero-touch provisioning via TR-069 and XML configuration files


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 IPv6 dual stack to help with migration to IPv6

Platform Support information

The Cisco ATA 191 Multiplatform Analog Telephone Adapter is designed to work with Cisco Webex Calling, BroadCloud and BroadWorks, and other third-party call control system Metaswitch, Asterisk.

Licensing information

No license is required to connect the Cisco ATA 191 Multiplatform Analog Telephone Adapter to third-party call control systems.

Product specifications



Physical dimensions (H×W×D)

3.9 x 3.9 x 1.1 in. (100 × 100 × 28 mm)


4.7 oz (132.1 g)


Interface: Two RJ-11 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: 25 mA +/- 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/AAAA and SRV records

Dynamic Host Configuration Protocol (DHCP) client

Internet Control Message Protocol (ICMP)

Simple Network Time Protocol (SNTP)

Cisco Discovery Protocol

Link Layer Discovery Protocol (LLDP)

Point-to-Point Protocol over Ethernet (PPPoE)

Quality of Service (QoS)

IEEE 802.1p/Q (QoS and VLAN tagging)

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


Anonymous call and call blocking

Call forwarding: No answer, busy, and all

Call hold and resume

Caller ID blocking

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 return, and call back on busy

Call waiting

Configurable ring frequency

Configurable tones and cadences

Disconnect tone

Distinctive ringing: Calling and called number

Do not disturb

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

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


Selective and anonymous call rejection

SIP redundancy

Speed dial

Streaming audio server: Up to 4 sessions

Three-way conference calling with local mixing

Tip and ring voltage adjustment setting

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

Network Address Translation (NAT)

Session Traversal Utilities for NAT (STUN)


Codec: G.711 a-law, G.711 μ-law, G.729a, G.729ab, G.726

Codec name assignment

Full-duplex audio

Echo cancellation

Voice activity detection

Silence suppression

Configurable silence threshold

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


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

Automatic negotiation on transmission rate

Provisioning and management

Cloud provisioning (remote configuration)

Web-based administration

Interactive Voice Response (IVR)

Automated provisioning and upgrading via HTTP, HTTPS, and TFTP


SSH access

Simple Network Management Protocol (SNMPv3)

Report generation and event logging

Dedicated PRT button

Support for RTP statistics

Syslog (multilevel granularity)

Ping and trace route diagnostics

Configuration management: Backup and restore

Dual image


Password-protected system reset to factory default

Password-protected administrator and user access authority

Provisioning, configuration, and authentication

HTTPS with factory-installed client certificate

Advanced Encryption Standard (AES) encryption

SIP over Transport Layer Security (TLS1.1 and TLS1.2)

Secure (encrypted) calling using Secure RTP (sRTP)

Encrypted configuration files

Image authentication

Secure boot

Secure Shell (SSH)


DC input voltage: 5V DC at 2.4A maximum

Power consumption: 5W

Switching type (100-240V) automatic

Power adapter: 100-240V and 50-60 Hz (26-34 VA) AC input, with 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

Ordering information

Part number

Product description


2-port analog telephone adapter for multiplatform


Spare power adapter for ATA 191 and ATA 192

Warranty information

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

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