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Cisco SPA112

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MSRP: $69.00
Price: $57.03
Store #: 9657
Manufacturer: Cisco
Manufacturer Part No: SPA112

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1-year warranty

Cisco SPA112

The Cisco SPA112 2 Port Phone Adapter enables high-quality, feature-rich VoIP service through a broadband Internet connection. Easy to install and use, the adapter connects to a router or gateway and then provides two independent standard telephone ports to connect analog phones or fax machines to a VoIP service provider for clear voice calls, reliable fax connections, and simultaneous Internet use. The standards-based SPA112 is compatible with Internet VoIP provider features such as caller ID, call waiting, voicemail, call forwarding, distinctive ring, and much more to provide a complete, affordable, and highly reliable VoIP solution.


Enables high-quality, feature-rich voice over IP (VoIP) service through a broadband Internet connection

Two standard telephone ports, each with an independent phone number, for use with analog phones or fax machines

High-quality, clear-sounding voice, using advanced voice quality of service (QoS) capability

Compatible with all common telephone features, such as caller ID, call waiting, and voicemail

Ideal solution for residential, home office, and small business environments



Toll-quality voice and carrier-grade feature support: The Cisco SPA112 delivers clear, high-quality voice communication under a variety of network conditions. Excellent voice quality in challenging, changeable IP network environments is made possible via the advanced implementation of standard voice coding algorithms. The SPA112 is interoperable with common telephony equipment such as fax, voicemail, private branch exchange (PBX)/key telephone system (KTS), and interactive voice response systems.

Large-scale deployment and management: The Cisco SPA112 enables service providers to provide customized services to their subscribers. It can be remotely provisioned and supports dynamic, in-service software upgrades. A highly secure profile upload saves providers the time and expense of managing and preconfiguring or reconfiguring customer premises equipment (CPE) for deployment.

Ironclad security: The Cisco SPA112 supports highly secure, encryption-based methods for communication, provisioning, and servicing.

Cisco SPA112 Specifications


*Note: Many specifications are programmable within a defined range or list of options. Please see the SPA100 Series Administration Guide for details. The configuration profile is uploaded to the SPA112 at the time of provisioning.

Data networking

MAC address (IEEE 802.3)

IPv4 (RFC 791) upgradeable to IPv6 (RFC 1883)

Address Resolution Protocol (ARP)

DNS-A record (RFC 1706), SRV record (RFC 2782)

Dynamic Host Configuration Protocol (DHCP) client (RFC 2131)

Point-to-Point Protocol over Ethernet (PPoE) client (RFC 2516)

Internet Control Message Protocol (ICMP) (RFC 792)

TCP (RFC 793)

User Datagram Protocol (UDP) (RFC 768)

Real Time Protocol (RTP) (RFC 1889) (RFC 1890)

Real Time Control Protocol (RTCP) (RFC 1889)

VLAN tagging (IEEE 802.1p)

Simple Network Time Protocol (SNTP) (RFC 2030)

Session Initiation Protocol (SIP) channels support both UDP and TCP transport

Voice gateway

Session Initiation Protocol (SIP) v2 (RFC 3261, 3262, 3263, 3264)

SIP proxy redundancy: Dynamic via DNS SRV A records

Reregistration with primary SIP proxy server

SIP support in network address translation (NAT) networks (including Serial Tunnel [STUN])

Highly secure (encrypted) calling via Secure RTP

Codec name assignment

G.711 (A-law and μ-law)

G.726 (32 kbps)

G.729 A

Dynamic payload

Adjustable audio frames per packet

Dual-tone multifrequency (DTMF): In-band and out-of-band (RFC 2833) (SIP info)

Voice 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/G.168)

Voice activity detection (VAD)

Silence suppression

Comfort noise generation (CNG)

Attenuation/gain adjustments

Flash hook timer

Message waiting indicator (MWI) tones

Visual messaging waiting indicator (VMWI) via frequency shift keying (FSK)

Polarity control

Hook flash event signaling

Caller ID generation (name and number): Bellcore, DTMF, European Telecommunications Standards Institute (ETSI)

Streaming audio server: Up to 10 sessions

Music on hold

Call waiting, call waiting caller ID

Caller ID with name and number 

Caller ID blocking

Selective and anonymous call rejection

Call forwarding: No answer, busy, all

Do not disturb

Call transfer, call return, call back on busy

Three-way conference calling with local mixing

Per-call authentication and associated routing

Call blocking with toll restriction

Distinctive ringing: Calling and called number

Off-hook warning tone

Advanced inbound and outbound call routing

Hot line and warm line calling

Long silence (configurable time setting) silence threshold

Disconnect tone (e.g., reorder tone)

Configurable ring frequency

Ring validation time setting

Tip/ring voltage adjustment setting

Ring indication delay setting

Fax capability

Fax tone detection pass-through

Fax pass-through using G.711

Real-time fax over IP via T.38 fax relay (T.38 support is dependent on fax machine and network/transport resilience)


Password-protected system reset to factory default

Password-protected administrator and user access authority


HTTPS with factory-installed client certificate

HTTP digest: Encrypted authentication via MD5 (RFC 1321)

Up to 256-bit Advanced Encryption Standard (AES) encryption

SIP TLS (Transport Layer Security)

Provisioning, administration, and maintenance

Web browser administration and configuration via integral web server

Telephone keypad configuration with interactive voice prompts

Automated provisioning and upgrade via HTTPS, HTTP, Trivial File Transfer Protocol (TFTP)


Asynchronous notification of upgrade availability via NOTIFY

Nonintrusive, in-service upgrades

Report generation and event logging

Stats in BYE message

Debug server records and syslog: Per-line configurable web browser

Ping and traceroute diagnostics

Configuration management: Backup and restore

Support for Bonjour

Physical interfaces

1 WAN 100BASE-T RJ-45 Ethernet Port (IEEE 802.3)

2 RJ-11 FXS phone ports for analog circuit telephone device (tip/ring)

Reset button

Subscriber line interface circuit (SLIC)

Ring voltage: 40-90 Vpk configurable

Ring frequency: 20-25 Hz

Ring waveform: trapezoidal

Maximum ringer load: 5 ringer equivalence numbers (RENs)

On-hook/off-hook characteristics:

On-hook voltage (tip/ring): -46 ~ -56V

Off-hook current: 18-25 mA

Terminating impedance: 600 ohm resistive or 270 ohm + 750 ohm

150 nF complex impedance

Frequency response 300-3400 Hz

Return loss (600 ohm, 300-3400 Hz) up to 20 dB

Insertion loss (1 Vrms at 1 kHz) 3-4 dB

Total harmonic distortion (THD) (350 mV peak at 300 Hz) up to 3%

Idle channel noise-72 dB (typical)

Longitudinal balance 55 dB (typical)

Off-hook threshold (line seizure) Rdc < 1000 ohm

On-hook threshold (line release) Rdc >10000 ohm

Rdc DC supervisory range Rdc > 450 ohm

Regulatory compliance

FCC (Part 15 Class B), CE, ICES-003, A-Tick certification, Restriction of Hazardous Substances (RoHS), UL

Power supply

DC input voltage: +5V DC at 2.0A max.

Power consumption: 5W

Switching type (100-240V) automatic

Power adapter: 100-240V - 50-60 Hz (26-34 VA) AC input, 1.8 m cord

Indicator lights/LED

Phone 1, Phone 2, Internet, Power


Quick Start Guide

Administration Guide – available online

Provisioning Guide– available online



W x H x D

3.98 x 3.98 x 1.10 in.

(101 x 101 x 28 mm)

Unit weight

5.40 oz (153 g)

Operating temperature

32º to 113ºF (0º to 45ºC)

Storage temperature

-77º to 158ºF (-25º to 70ºC)

Operating humidity

10% to 90% noncondensing

Storage humidity

10% to 90% noncondensing

Package Contents

Cisco® SPA112 2 Port Phone Adapter

5V/2A power adapter

6-foot (1.83m) Ethernet cable

Quick Start Guide

CD with documentation, including license and warranty

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