Cisco ATA 191


The Cisco ATA 191 brings traditional analog telephony devices into the IP world.

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Cisco ATA 191
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Product details
Turning traditional devices into IP devices.

This bestseller for analogue-to-digital conversion turns traditional telephone, fax, and overhead paging communications devices into IP devices for greater cost-effectiveness and modern telephony.

Excellent voice quality. For enterprise-level communication.

The Cisco ATA 191 offers a clear, natural-sounding voice quality thanks to advanced preprocessing, high-performance echo cancellation, voice activity detection, and comfort noise generation for an excellent telephony experience. 

A device that meets your needs. Offering flexibility and configuration.

Two standard FXS ports can be configured independently as two SIP registrations. Easily protect and extend existing investment in analog systems - or smooth your migration to pure VoIP in a more affordable and reliable way.  

An excellent workflow. Making your work easier.

Modern telephony features that improve your working experience. Call hold and resume, forwarding, configurable ring frequency, tones and cadences and many more features allow an efficient call management and configuration for easy call and audio control. 

Keeping connections secure and reliable.

The ATA 191 provides a complete security solution for both media and signaling. A dedicated button for problem reporting and log collection improves the serviceability of your device.

Technical details

Full lines supported
Two standard FXS ports can be configurated as 2 lines (SIP registrations)
Audio features
  • Offers clear, natural-sounding voice quality via advanced preprocessing, high-performance echo cancellation, voice activity detection, and comfort noise generation.
  • 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
Telephony features
  • 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)
  • Call pickup and group pickup
  • Call transfer, call return, and call back on busy
  • Call waiting
  • Configurable ring frequency, 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
  • Redial
  • 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)
  • 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
Network features
  • MAC addresse
  • 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)
  • HTTP
  • 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)
Security features
  • 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)
Cisco ATA 191
Size (H x W x D)
100 mm × 100 mm × 28 mm (3.9 in x 3.9 in x 1.1 in)
132.1 g (4.7 oz )
Software and user 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
  • 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 
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+AC:2015
  • 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
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