The Cisco ATA191 Analog Telephone Adapter brings traditional analog phones and fax machines into advanced VoIP networks. Designed for businesses and service providers transitioning to IP telephony, this adapter offers secure voice quality, enterprise-grade reliability, and flexible integration with Cisco Unified Communications solutions.
Compact and efficient, the ATA191 includes two FXS ports and robust SIP support, along with built-in security protocols like TLS and SRTP. It's the ideal choice for organizations upgrading legacy analog infrastructure to modern IP-based systems without replacing existing analog endpoints.
Key Features & Benefits
Dual FXS ports for connecting analog phones or fax machines to VoIP networks
Full SIP support with IPv4/IPv6 dual stack compatibility
Enhanced voice quality with MOS > 4.0, echo cancellation, and adaptive jitter buffer
Multiple telephony features including call transfer, conferencing, speed dial, and caller ID
Centralized provisioning and remote management via HTTPS, TFTP, and SSH
Secure boot, TLS encryption, sRTP for voice security, and AES configuration protection
Wall-mountable compact design with LED indicators and PRT (Problem Reporting Tool)
Ideal for extending Cisco UC to remote users, branches, or analog device integrations
Ideal Uses
Small businesses transitioning to VoIP without replacing analog devices
Branch offices or remote users connecting legacy phones to Cisco UC
Hotels or hospitals using analog phones integrated into IP systems
Fax machine or modem connectivity in IP telephony environments
Specifications
Condition: device has been unpacked and inspected, never deployed
Brand: Cisco
Model: ATA191 190 Series
Physical Dimensions: 3.9 × 3.9 × 1 in (100 × 100 × 28 mm)
Weight: 132.1 g (4.7 oz)
Interfaces: 2 × RJ11 FXS ports, 1 × 10/100 Mbps RJ45 Ethernet, Reset/PRT button
Indicators: LEDs for Power, Network, Phone 1, Phone 2, PRT
Mounting: Wall-mountable
Telephony Features: Call forward, call waiting, conferencing, caller ID, distinctive ring, MWI, hotline
Audio Codecs: G.711 a-law/-law, G.729a, G.729ab
Voice Enhancements: Full-duplex, echo cancellation, silence suppression, dynamic jitter buffer
Fax/Modem Support: T.38 relay, G.711 pass-through
Network Protocols: SIP, RTP, RTCP, TCP/UDP, DHCP, SNTP, LLDP, CDP, IPv4/IPv6 dual stack
QoS Support: IEEE 802.1p/Q, DiffServ / ToS
Security: TLS 1.1/1.2, HTTPS, SSH, sRTP, secure boot, encrypted configs
Power Input: 5V DC @ 2.4A, Adapter input: 100240V AC, 50/60Hz
Power Consumption: 5W
MTBF: 300,000 hours
Operating Temperature: 0°C to 40°C
Humidity Range: Operating 1090% RH
Compliance (Regulatory): CE, FCC Part 15, VCCI, ICES-003
Compliance (Safety): UL 60950-1, IEC/EN/CSA standards
Compliance (EMC): CISPR 32, EN 55032, EN 55024, IEC 61000 standards
Warranty: 3 Month Carry-in Warranty
What's in the Box: Cisco ATA191 Analog Telephone Adapter
