Cisco Systems
Analog Telephone Adaptor (ATA)

2 FXS Ports
1 WAN Port




The Cisco SPA112 2 Port Adapter enables high-quality VoIP service with a comprehensive feature set through a broadband Internet connection. Easy to install and use, it works over an IP network to connect analog phones and fax machines to a VoIP service provider and provides support for additional LAN connections.  
The Cisco SPA112 includes two standard telephone ports to connect existing analog phones or fax machines to a VoIP service provider. Each phone line can be configured independently. With the Cisco SPA112, users can protect and extend their investment in their existing analog telephones, conference speakerphones, and fax machines as well as control their migration to IP voice with an extremely affordable, reliable solution.  
Compact in design and compatible with international voice and data standards, the Cisco SPA112 can be used with residential, home-office, and small business VoIP service offerings, including full-featured hosted or ̣open source IP PBX environments. This easy-to-use solution delivers advanced features to better connect employees and serve customers, all on a highly secure Cisco network.  

The Cisco SPA112 2 Port Adapter (Figures 1 and 2): 

  • Enables high-quality VoIP service with a comprehensive feature set through a broadband Internet connection 
  • Provides high-quality, clear-sounding voice, using advanced voice quality-of-service (QoS) capabilities and
  • the industry-leading voice Session Initiation Protocol (SIP) stack 
  • Supports reliable faxing with simultaneous voice and data use 
  • Includes two standard telephone ports, each with an independent phone number, for use with fax machines
  • or analog phone devices 
  • Is compatible with all industry voice and data standards and common telephone features such as caller ID,
  • call waiting, and voicemail 
  • Includes a simple-to-use web-based configuration utility for easy deployment 




User Manual



Technical Specification


  • Voice, Fax, Modem

  • Telephony Features
    Independent configurable dial plans with interdigit timers and IP dialing (1 per port)Call progress tone generation
    Jitter buffer: Adaptive
    Frame loss concealment
    Full-duplex audio
    Echo cancellation (G.165 and G.168)
    Voice ac
  • Voice Codecs
    SIPv2 (RFC 3261, 3262, 3263, and 3264)
    SIP proxy redundancy: Dynamic through use of DNS SRV A records
    Reregistration with primary SIP proxy server
    SIP support in network address translation (NAT) networks (including Serial T
  • Fax Over IP
    Fax pass-through using G.711
    Real-time fax over IP using T.38 fax relay
  • Disconnect Methods
    Polarity control
    Hook flash event signaling
  • Interfaces

  • Telephone Interfaces
    2 RJ-11 FXS phone ports for analog circuit telephone device (tip and ring)
  • Network Interfaces
    1 WAN 100BASE-T RJ-45 Ethernet Port (IEEE 802.3)
  • Signaling

  • Network Protocols
    VLAN tagging (IEEE 802.1p)
    ARP, DHCP client, DNS, ICMP, PPPoE client
  • DTMF Method
    In-band and out-of-band (RFC 2833) (SIP information)
  • Provisioning and Control
    Automated provisioning and upgrade using HTTPS, HTTP, and Trivial File Transfer Protocol (TFTP)
  • Management
    Web browser administration and configuration using integral web server,
    Ping and traceroute diagnostics
  • Environmental

  • Dimension and Weight
    101 x 101 x 28 mm
  • Operating Temperature/Humidity
    0 to 45ºC , 10 to 90%
  • Power Supply

  • RPS Input/Output
    DC input voltage: 5V DC at 2.0A maximum,
    100–240V and 50–60 Hz (26–34 VA) AC input
  • Power Consumption
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