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Cisco Small Business > 
Item#: 9SIA36Z1XG2479

Cisco Small Business SPA112 2-Port Phone Adapter

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

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

Learn more about the Cisco Small Business SPA112


Cisco Small Business




Password-protected system reset to factory default
Password-protected administrator and user access authority
Provisioning, configuration, and authentication
HTTPS with factory-installed client certificate
HTTP digest: Encrypted authentication using MD5 (RFC 1321)
Up to 256-bit Advanced Encryption Standard (AES) encryption
SIP Transport Layer Security (TLS)
1 WAN 100BASE-T RJ-45 Ethernet Port (IEEE 802.3)
2 RJ-11 FXS phone ports for analog circuit telephone device (tip and ring) Reset button
Phone 1, phone 2, Internet, and power
DC input voltage: 5V DC at 2.0A maximum
Power consumption: 5W
Switching type (100–240V) automatic
Power adapter: 100–240V and 50–60 Hz (26–34 VA) AC input, with 1.8m cord
3.98" x 3.98" x 1.10"
5.40 oz.
0ºC to 45ºC
10% to 90%, Non-Condensing
Data networking:
MAC address (IEEE 802.3)
IPv4 (RFC 791) upgradeable to IPv6 (RFC 1883)
Address Resolution Protocol (ARP)
Domain Name System (DNS) A record (RFC 1706) and 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)
SIP channels support for both UDP and TCP transport

Voice gateway:
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 Tunnel [STUN])
Highly secure (encrypted) calling using Secure RTP (SRTP)
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 information)

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 and G.168)
Voice activity detection (VAD)
Silence suppression
Comfort noise generation (CNG)
Attenuation and gain adjustments
Flash hook timer
Message waiting indicator (MWI) tones
Visual messaging waiting indicator (VMWI) using frequency shift keying (FSK)
Polarity control
Hook flash event signaling
Caller ID generation (name and number): Bellcore, DTMF, and European Telecommunications Standards
Institute (ETSI)
Streaming audio server: Up to 10 sessions
Music on hold
Call waiting, call waiting and caller ID...
*More information. Please visit Cisco website.


Affordable and Feature-Rich Voice over IP (VoIP)

Toll-quality voice and carrier-class feature support

Large-scale deployment and management

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

Compact size: Designed for small spaces, the Cisco SPA112 can be installed as a desktop unit or mounted on a wall.

Comprehensive feature set:
The standards-based Cisco 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 solution for high-quality VoIP.

Easy installation and changes: The web-based configuration utility enables quick deployment and easy changes.


Package Contents
Cisco SPA112 2 Port Phone Adapter
5V/2A power adapter
6-ft (1.83m) Ethernet cable
Quick Start Guide
CD with documentation, including license and warranty
Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details

Customer Reviews of the Cisco Small Business SPA112

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  • Russell S.
  • 4/17/2014 4:07:13 PM
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggs

Pros: Running an asterisk server at the house and this works with my old analog phone as expected.

Cons: The config/web interface is a bit in depth, so you may have to RTM.

Did you find this review helpful? Yes No

  • Anonymous
  • 4/17/2014 9:52:38 AM
  • Ownership: 1 month to 1 year

5 out of 5 eggsWorks Great for voip faxing

Pros: Perfect for voip faxing, no delays and gets the job done. had to tweak a few settings, go to voice settings and go to specific line, and select modem line yes/no

Cons: not great for pure voice

Did you find this review helpful? Yes No

  • elliot S.
  • 3/27/2014 8:45:48 AM
  • Ownership: 1 day to 1 week
  • Verified Owner

1 out of 5 eggsecho echo

Pros: works, except for the echo problem...

Cons: echo. The calling party can hear everything they say echoed back to them very loudly, with about a 1/2 second delay or so, thereby making it impossible for them to concentrate on the conversation with you.
I called cisco's tech support but I called the wrong number on their web site - I called the number for their consumer products. So I had to hang up and call the number for their business products. I got connected with a tech in Bulgaria who was very nice, had very good English, but insisted that before he could help me, I would have to create an account on the cisco web site. So while he waited on the line I tried to create the account, but it wouldn't accept my registration because I couldn't seem to get a password that was acceptable, despite trying different combinations of letters, numbers, caps and non-caps, special characters, no special characters, etc. I just decided to give up and return the devices to newegg. Same problem on both the SPA122 and the SPA112, using the service provider named callcentric. Callcentric provided all the settings specific to this device, and I also flashed these devices to the latest firmware. I hunted around for echo settings, and the echo cancellation is turned on. I couldn't find any settings to adjust the input/output gain of the phone jack. googled around for solutions, found none. Made sure to put the calling and called phones in different rooms to eliminate all feedback, and echo was still there on every call.
I'm guessing that the echo has always been there on phone calls, but on traditional analog phone lines we never noticed it because there was never this delay introduced by the digital circuit. now that we have digital circuits which have an inherent delay in them, without a good DSP that cancels echo, we get echo. I notice that if the calling party is on a low quality phone, the echo is not nearly as bad, but when using a higher quality headset, I can hear much better, and unfortunately that means I can hear the echo better as well. I'm going to return these devices and try a different brand of ATA, and hope that it's not the same chipset and same DSP in next brand that I try. Maybe eventually there will be a firmware release that fixes this echo. (my Current firmware version: 1.3.3 (015)) Until then, do not buy unless you want your callers to have an echo.

Other Thoughts: makes a great gift for someone you really don't like.
when buying this or any other brand of ATA, get two so you can test them. callcentric has free accounts with free in-network calling, helped greatly for testing.

0 out of 2 people found this review helpful. Did you? Yes No

  • Kevin K.
  • 2/13/2014 4:32:42 PM
  • Ownership: 1 day to 1 week

1 out of 5 eggsMost complicated thing I've ever used

Pros: None really...

Cons: Tons! This is the most complicated thing I've ever used to setup. Made it to the Line 1 page to configure Line 1 and all it would say after 40 seconds between saves is "Registration failed". Thanks cisco...

Logging was disabled by default and low and behold didn't even work on the shipped firmware. After updating to 1.3.0 the latest, it wasn't even much help at all. Just random gibberish like 'cmd 5 response 8'. Nice one cisco! Really helps.

Linksys PAP2, old but at least it works and is easy to setup! This thing is terrible.

0 out of 1 people found this review helpful. Did you? Yes No

  • Karl K.
  • 9/18/2013 8:33:11 AM
  • Ownership: 1 month to 1 year

2 out of 5 eggsDead Nic

Pros: Supports tons of VoIP features .

Cons: Network port died after 3 months.

Other Thoughts: Way cheaper than buying an analog adapter for my PBX.

Did you find this review helpful? Yes No

  • Garth I.
  • 4/6/2013 4:17:55 AM
  • Ownership: less than 1 day
  • Verified Owner

5 out of 5 eggs20 min up and running

Pros: up and running in 20 mins, would have been quicker but one password was wrong, using both ports for two phone lines, replacing the spa2102, that one worked good too, but didnt need the router since i using a adsl router

Cons: fast set up, very nice new friendly interface compared to the spa2102, very nice right off the get go, just a couple of tweaks of some of the settings and ringing off the hook,

Other Thoughts: so far, no problems that i can tell you about

Did you find this review helpful? Yes No

1 out of 5 eggsnon stop problems

Pros: small, cheap

Cons: unreliable, drops calls, drops registration,

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  • Simon R.
  • 7/3/2012 10:23:33 PM
  • Ownership: 1 day to 1 week
  • Verified Owner

2 out of 5 eggsNeed a PBX

Pros: I'm sure this is a fine product but...

Cons: It needs a PBX. If you are a mediums sized business that's probably not a show stopper. If you aren't you'll need to install some kind of PBX software such as Asterisk. It takes a bit of work to configure but it does work. However, it will meen keeping the machine running asterix on 24x7 to keep a phone service. It also lacks a line in for your old analog POTS line so you have to dedicate the handset to VOIP. With Obi products, setup is easier and you share the handset between VOIP and POTS.

Other Thoughts: Poorly suited to non-business users

1 out of 9 people found this review helpful. Did you? Yes No

  • Lisa N.
  • 5/19/2012 3:38:59 PM
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsEasy

Pros: Simple setup. Disconnected the house line from the box outside, and just plugged this into a phone jack inside. All phones are now on an extension to our PBX.

Cons: It dropped out only once. Not sure of the cause, but it's been running fine for over a month now.

2 out of 2 people found this review helpful. Did you? Yes No

  • Anonymous
  • 1/6/2012 7:25:43 AM
  • Ownership: less than 1 day
  • Verified Owner

3 out of 5 eggs

Pros: I bought the SPA112 because it's the newest ATA from Cisco replacing the Linksys/Cisco PAP2T. The device was pretty easy to setup. I had mine up and running in literally 5 minutes. There's even a "quick setup" that's supposed to get you up and running quickly where it asks you to enter info like the proxy, user id, and password. For my setup, I had to change additional settings so I didn't use the quick setup.

Cons: Caller ID doesn't work at all on phones connected to the SPA112. This is a big con for me. This issue is known by Cisco's development teams. Search the internet for "SPA112 not allowing caller id to show". Hopefully they fix this issue soon with a firmware update.

4 out of 4 people found this review helpful. Did you? Yes No

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