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)

Fax

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
HTTPS
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)

Componets: 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)

Weight: 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

Power