Cisco ATA191-3PW-K9 – 2-Port Analog Telephone VoIP Adapter (FXS | SIP | PoE | T.38 Fax)

The Cisco ATA191-3PW-K9 is a dual-FXS port analog telephone adapter designed to bridge legacy analog phones, fax machines, and modems with modern IP-based VoIP systems. Engineered for flexibility, security, and crystal-clear voice, it integrates easily with Cisco Webex, BroadSoft, Asterisk, Metaswitch, and most SIP-based PBXs. Its compact, wall-mountable design, Power over Ethernet (PoE) support, and robust T.38 fax compatibility make it ideal for businesses transitioning to IP voice infrastructure without abandoning existing analog investments.

Key Features & Benefits

• Dual FXS RJ-11 ports for connecting analog phones, fax machines, or paging systems
• SIP protocol support compatible with Cisco Webex, BroadCloud, Asterisk, and third-party VoIP systems
• G.711, G.729ab, G.726 codecs + T.38 Fax Relay for excellent call clarity and IP faxing
• PoE enabled (802.3af) for simplified single-cable deployments and reduced clutter
• Secure encrypted communications with SRTP, TLS 1.2, AES, HTTPS provisioning
• IPv4/IPv6 dual-stack support for modern networking environments
• QoS tagging (802.1p/Q, DiffServ, ToS) and adaptive jitter buffer for reliable call quality
• Plug-and-play deployment with TR-069, web GUI, CLI, SSH and automated provisioning
• Wall-mountable, space-saving chassis ideal for small businesses, hotels, or branch locations
• Visual MWI (Message Waiting Indicator), caller ID, call transfer, 3-way conferencing

Technical Specifications

• Manufacturer: Cisco Systems
• Model: ATA191-3PW-K9
• Ports: 2 x RJ-11 FXS, 2 x 10/100 RJ-45 Ethernet
• Power Supply: PoE or 5V DC (external adapter)
• Protocols: SIP, RTP, RTCP, HTTPS, TFTP, TR-069
• Codecs: G.711 a/μ-law, G.729ab, G.726, T.38
• Management: Web GUI, SSH, SNMPv3, CLI, IVR
• QoS: IEEE 802.1p/Q, DiffServ, ToS, VLAN tagging
• Security: TLS 1.2, SRTP, AES encryption, secure boot
• Mounting: Tabletop or wall mount
• Dimensions: 3.9" x 3.9" x 1.1"
• Weight: 4.66 oz
• Operating Temp: 32°F to 104°F (0°C to 40°C)
• Compliance: FCC, CE, UL, VCCI, RoHS, EN55032 Class B

Frequently Asked Questions

• Can this adapter connect fax machines?
  Yes, it supports T.38 and G.711 pass-through for reliable fax-over-IP.
• Is it compatible with third-party VoIP providers?
  Yes, it supports open SIP for use with many providers and platforms.
• Does it require an external power supply?
  Only if PoE is not available; a DC power adapter is included.
• Can I use both FXS ports simultaneously?
  Yes, both ports operate independently for two concurrent analog lines.
• Is remote provisioning supported?
  Yes, via HTTPS, TFTP, TR-069, and Cisco provisioning servers.
• Is it suitable for hotel or retail environments?
  Absolutely—compact and wall-mountable with multi-device support.
• Does it support encryption?
  Yes, including SRTP and TLS for secure voice and signaling traffic.
• Can it be mounted on a wall?
  Yes, wall-mounting is supported with included hardware.