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Cisco ATA 191: 2-Port Analog Telephone Adapter for VoIP Integration

  • Superior Voice Quality: Leverages advanced preprocessing and echo cancellation for crystal-clear, natural-sounding voice communications.
  • Dual Independent SIP Registrations: Features two standard FXS ports, allowing for independent configurations and simultaneous SIP registrations.
  • Comprehensive Security: Offers encrypted voice communications and full signaling security, supporting IPv6 for future-proof network compatibility.
  • Easy Deployment and Management: Simplifies setup and integration with central provisioning via Cisco Unified Communications Manager, enhancing serviceability with a dedicated PRT button.
  • Wide Compatibility: Seamlessly integrates with Cisco call control systems, ensuring flexible and reliable connectivity for enterprise networks and small offices.

Cisco ATA 191 2-Port Analog Telephone Adapter: Bridging Traditional Telephony and Modern IP Networks


Product Overview

In the ever-evolving landscape of telecommunications, the Cisco® ATA 191 Analog Telephone Adapter emerges as a pivotal solution for integrating traditional analog telephony devices with the cutting-edge capabilities of IP networks. This 2-port handset-to-Ethernet adapter is meticulously engineered to transform your conventional telephone, fax, and overhead paging communications into efficient IP devices, optimizing cost-effectiveness and leveraging the advanced applications of IP telephony.

Key Features for Technical Professionals


  • Voice Quality: The Cisco ATA 191 ensures superior voice quality with its advanced preprocessing, echo cancellation, and noise reduction technologies. Experience clear, natural-sounding voice communications, crucial for maintaining professional and effective telephony interactions.
  • Security and Compliance: Prioritizing security, the ATA 191 offers a comprehensive solution that covers both media and signaling. This includes encrypted voice communications and IPv6 support, ensuring your communications network is secure, compliant, and future-proof.
  • Simplified Deployment: Deployment is streamlined through central provisioning and configuration via the Cisco Unified Communications Manager interface, significantly easing the setup process and integration into existing networks.
  • Reliability and Support: Designed for use across enterprise networks, small offices, or with cloud-based unified communications services, the ATA 191 is backed by Cisco’s renowned reliability and support, ensuring consistent performance and durability.

Enhancing Your Communications Network

With two standard FXS ports capable of independent SIP registrations, the Cisco ATA 191 Adapter not only preserves but enhances your investment in analog systems. It represents the bridge between traditional telephony and the vast possibilities of voice over IP, offering an affordable and reliable pathway to modernizing your communications infrastructure.

Intuitive Design and Connectivity

Caption: “Sleek, compact, and wall-mountable design fits seamlessly into any office environment.”

Advanced Security Features

Caption: “Robust encryption and security protocols ensure your communications are protected.”

Seamless Network Integration

Effortless integration with existing Cisco call control systems for a unified communication experience.”

Empower Your Communication with Axion and Cisco

Choosing the Cisco ATA 191 Analog Telephone Adapter through Axion Communications means selecting a partnership that values quality, reliability, and advanced technology. Whether connecting to enterprise networks, enhancing small office setups, or embracing the shift towards unified communications from the cloud, the Cisco ATA 191 is your key to unlocking a new realm of telephony efficiency and effectiveness.

Discover More

To explore how the Cisco ATA 191 can revolutionize your communication systems and for more information on our comprehensive VoIP services, visit Axion Communications’ product page.

Product Specifications for Cisco ATA 191 Analog Telephone Adapter

  • Physical Dimensions (H×W×D): 3.9 x 3.9 x 1 in. (100 × 100 × 28 mm)
  • Weight: 4.7 oz (132.1 g)
  • Hardware Interface: Two RJ11 FXS ports, one 10/100 Mbps RJ-45 Ethernet port
  • Buttons: Reset / Problem Reporting (PRT)
  • LED Indicators: Power, Network, Phone 1, Phone 2, PRT
  • Wall Mountable: Yes
  • Subscriber Line Interface Circuit (SLIC) Features:
    • 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
  • Networking Capabilities: Includes IPv4/IPv6 dual stack, SIP, TCP/UDP, RTP/RTCP, and more.
  • Telephony Features: Includes call forwarding, call hold and resume, caller ID, and many more telephony functionalities.
  • Audio Codecs: G.711 a-law, G.711 μ-law, G.729a, G.729ab, full duplex audio, echo cancellation, and more.
  • Fax and Modem Support: Real-time fax over IP via T.38 fax relay and fax pass-through via G.711.
  • Provisioning and Management: Central configuration, IVR, automated provisioning and upgrades, and more.
  • Security Features: System reset to factory default, password-protected access, AES encryption, SIP over TLS, secure RTP, and more.
  • Power Requirements: DC input voltage: 5V DC at 2.4A maximum, power consumption: 5W.
  • Reliability: Mean Time Between Failures (MTBF): 300,000 hours.
  • Compliance and Safety: Meets various regulatory and safety standards including CE, UL, IEC, and more.

Ordering Information

  • ATA191-K9: 2-Port Analog Telephone Adapter
  • ATA191-PWR: Spare Power Adapter for ATA 191 and ATA 192

Warranty Information

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



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  • Dual-band Wi-Fi (2.4 GHz/5 GHz), Dual Gigabit Ethernet ports

  • Gigabit Ethernet switch, Integrated Bluetooth

  • Dual Gigabit Ethernet, Integrated Bluetooth® 2.1 EDR

  • Dual Gigabit Ethernet, Wi-Fi option

  • Audio Quality

  • HD voice with Smart Noise Filtering

  • Wideband audio, full duplex speakerphone

  • HD Voice technology, Acoustic Clarity™ technology

  • Opus codec support, Full duplex speakerphone

  • Video Capabilities

  • None

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  • USB Ports

  • USB 2.0 for headset connection

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  • SIP Accounts

  • Up to four SIP accounts

  • Up to 5 SIP accounts

  • 16 SIP lines (registrations)

  • Eight SIP registrations

  • Additional Features

  • Power over Ethernet (PoE), Headset support via USB

  • Manual shutter for privacy, programmable soft keys

  • Voicemail and videomail support, Adjustable base height

  • Supports up to three 24-button Expansion Modules

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