High-performance 2-port Analog Telephone Adapter (ATA) for converting traditional analog devices to VoIP. Supports SIP, IPv4/IPv6 dual stack, T.38 fax relay, and secure cloud provisioning via TR-069.
| Model | Cisco ATA 191 |
| SKU | ATA191-3PW-K9 |
| Product Type | Analog Telephone Adapter |
| Ports | 2 x RJ-11 FXS ports, 1 x RJ-45 10/100 Mbps Ethernet port |
| VoIP Protocol | Session Initiation Protocol (SIP) |
| Voice Quality | MOS > 4.0, Echo Cancellation, Jitter Buffer < 150 ms |
| Codec Support | G.711 a-law, G.711 u-law, G.729a, G.729ab, G.726 |
| Fax Support | T.38 Fax Relay (Group 3), G.711 Pass-through |
| Networking | IPv4, IPv6, IPv4/IPv6 dual stack |
| Provisioning | TR-069, XML, HTTP, HTTPS, TFTP |
| Security | TLS 1.1/1.2, SRTP, AES Encryption, Secure Boot, SSH |
| Power Consumption | 5W |
| Input Voltage | 5V DC at 2.4A maximum |
| Dimensions (H x W x D) | 100 x 100 x 28 mm |
| Weight | 132.1 g (4.7 oz) |
| Operating Temperature | 0 to 40 C |
| Humidity | 10 to 90 percent noncondensing |
| Mounting | Wall mountable |
| FXS Interface | Ring voltage 40 to 90 Vpk configurable; Ringer Equivalence Numbers (RENs) 3 max |
| Line Characteristics | On-hook voltage -46 to -56V; Off-hook current 25 mA +/- 10 percent |
| Impedance | 600 ohm resistive, 900 ohm resistive, or 220 ohm + 820 ohm with 120 nF |
| Frequency Response | 300 to 3400 Hz |
| Return Loss | Up to 26 dB (600 ohm, 300 to 3400 Hz) |
| Noise Level | Idle channel noise < -65 dBm |
| Network Protocols | TCP, UDP, RTP, RTCP, HTTP, HTTPS, TFTP, ARP, DNS, DHCP, CDP, LLDP, PPPoE |
| Quality of Service | IEEE 802.1p/Q (VLAN tagging), DiffServ, ToS |
| Telephony Features | Call waiting, Caller ID (Bellcore/BT/ETSI), 3-way conferencing, MWI, DND, Speed dial |
| Audio Features | VAD, Comfort Noise Generation (CNG), Silence Suppression, Adaptive Jitter Buffer |
| Management | Web-based administration, IVR, SNMPv3, Syslog, PRT button (Problem Reporting) |
| Security Hardware | Secure Boot, Image Authentication, Password-protected reset |
| Reliability | MTBF 300,000 hours |
| Compliance | CE Mark, UL 60950, CAN/CSA-C22.2 No. 60950, FCC Part 15 Subpart B |
Seamlessly Connect Analog Devices to Modern IP Networks
The Cisco ATA191-3PW-K9 Analog Telephone Adapter enables businesses to transform traditional analog devices into fully functional IP endpoints. Designed for enterprise, SMB, and cloud communications environments, this adapter bridges legacy telephony with modern VoIP infrastructure while ensuring reliability, security, and cost efficiency. It is an ideal solution for organizations transitioning to IP-based communications without replacing existing hardware.
Key Benefits & Features
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Dual FXS Ports: Connect two analog devices simultaneously with independent SIP registrations for flexible deployment across voice, fax, or paging systems.
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Enterprise-Grade Voice Quality: Advanced echo cancellation, voice activity detection, and jitter management deliver clear and natural audio performance with a MOS score above 4.0.
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Dedicated PRT Button: Improves serviceability with a physical Problem Reporting Tool button for immediate log collection and event reporting.
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Secure VoIP Communications: Supports TLS 1.2, SRTP encryption, and HTTPS provisioning to protect sensitive signaling and media traffic.
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Provisioning: TR-069 and XML-based configuration are supported. Available options depend on firmware, service provider and deployment settings.
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Platform compatibility: Cisco lists Webex Calling, BroadCloud/BroadWorks, Metaswitch and Asterisk for this Multiplatform model. Confirm the supported software release, service and configuration before deployment.
Ideal Use Cases
- Enterprise VoIP migration while retaining analog phones, fax machines, and overhead paging.
- Small office and branch deployments requiring cost-effective, high-density telephony.
- Cloud calling environments using SIP-based platforms like Webex Calling.
- Hospitality and retail environments where legacy analog device integration is essential.
Technical Specifications
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Ports: 2 x RJ-11 FXS, 1 x RJ-45 10/100 Ethernet
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Protocols: SIP, TCP, UDP, RTP, RTCP, HTTP, HTTPS, DHCP, CDP, LLDP
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IP Support: IPv4, IPv6, dual stack
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Voice Codecs: G.711 a-law/u-law, G.729a/ab, G.726
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Fax Support: T.38 real-time fax relay and G.711 pass-through
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Power Consumption: 5W
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Dimensions: 100 x 100 x 28 mm
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Mounting: Desktop or wall-mountable
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QoS: IEEE 802.1p/Q, DiffServ, VLAN tagging
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Security: TLS 1.1/1.2, SRTP, AES encryption, Secure Boot
Request a quote for Cisco ATA191-3PW-K9
Send your intended provider or PBX, firmware requirements, quantity and delivery destination. Confirm condition, included power adapter and regional cord, provisioning requirements, availability and delivery terms in the quotation before ordering. Physical condition and manufacturer warranty eligibility must be confirmed for the offered unit.
Feature availability depends on firmware and configuration. Cisco notes that TR-069 may not operate when FIPS mode is enabled. Check the applicable administration guide for your deployment.
Browse networking equipment · Cisco ATA 191 Multiplatform data sheet
