Recommended Free Tools
iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
Automatic number identification (ANI) is a telecommunications system that identifies the billing account associated with a call. In 911 systems, ANI identifies the calling party and may provide a callback number. It is related to caller ID, but the terms are not interchangeable: ANI has a network role that depends on the service context.
What does ANI mean?
The Federal Communications Commission defines ANI as “A system that identifies the billing account for a call.” Its rule adds: “For 911 systems, the ANI identifies the calling party and may be used as a call back number.” FCC definition of ANI
In ordinary telephony, the key idea is identifying the billing account or telephone number associated with a call. In emergency calling, the relevant identifier can help identify the caller and support a return call. What ANI represents and how a network conveys it depend on the service.
Free tools Windows power users keep installed
One-click scans. No signup required.
Is ANI the same as caller ID?
No. ANI and caller ID are related forms of calling-number identification, but they have different meanings. The FCC’s discussion of a specific interstate ANI service described ANI as the billing number delivered for billing or routing, while caller ID was a separate, caller-facing service. FCC historical discussion of ANI and caller ID
#1 Best Overall
- Caller ID/Call Waiting
- 80-name/number Caller ID history
- 13-number memory
- Display dial
- Mute/flash.Last number redial.Ringer volume control.Desk/wall mountable.White
That FCC discussion describes a 1991 service arrangement, not a universal account of how current mobile or internet-based calls work. In that historical arrangement, ANI could be sent in-band or out-of-band with SS7 trunking and could arrive before or with the first ring. The FCC also said the particular ANI service it described could not be blocked by the caller under the technology then in use. Those technical and blocking statements should not be generalized to every modern network or service.
What is ANI used for?
ANI can support network and business functions that rely on identifying the number or account associated with an incoming call. The FCC’s examples include:
Rank #2
- Built-in Digital Answering System: Record up to 25 minutes of messages, outgoing announcements, and memos with easy playback and remote access — no need for a separate answering machine
- Large Tilt Display for Easy Viewing: Adjustable backlit LCD screen clearly shows Caller ID, call history, and menu options from any angle
- Reliable Corded Performance: Works during power outages for basic calling (line-powered); Caller ID and answering system require 4 AA batteries (not included)
- Caller ID: View incoming caller names and numbers with a 50-name/number call log for convenient call screening
- Convenient Features: Speakerphone, volume control, last number redial, and wall-mountable design — For everyday home or small office use.
- Routing calls based on geographic origin.
- Sending alarm signals.
- Checking access to secondary data services.
- Looking up customer or order information in customer-service and order-taking systems.
In a business system, an incoming number can be matched with stored account or transaction information. That is a lookup function; the ANI itself is not the customer record. FCC examples of ANI uses
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsHow does ANI relate to 911 and p-ANI?
For 911, ANI identifies the calling party and may be used as a callback number. Emergency-call routing can also use pseudo-ANI (p-ANI), a special identifier rather than an ordinary directory number.
Rank #3
- 25-Minute Digital Answering System — Never miss a message again. Record up to 25 minutes of incoming calls, outgoing announcements, and memos with easy instant playback, selective save/delete, and the ability to skip or repeat messages right from the handset or base
- Extra-Large Tiltable Backlit Display — See Caller ID names, numbers, time, and date at a glance — even Call Waiting. The oversized LCD tilts for the perfect viewing angle, reducing strain for seniors and anyone with vision needs
- Oversized Big Buttons — Large, high-contrast keys are easy to read and press — ideal for elderly users, arthritis, or low vision. Simple, frustration-free dialing every time
- Hands-Free Speakerphone — Talk and listen comfortably without holding the handset. Perfect for multitasking, note-taking, or including the whole family in the conversation
- Reliable Corded Design with Audio Assist — Works even during power outages. Audio Assist temporarily boosts volume and clarity for better hearing, plus an extra-loud ringer with visual flashing indicator
The FCC defines pseudo-ANI as a same-length number that is not a North American Numbering Plan (NANP) directory number and can carry a special meaning by agreement. ATIS describes p-ANI resources as non-dialable and says they are commonly used for routing and location display in certain E9-1-1 situations, including calls from mobile or nomadic users. FCC ANI and pseudo-ANI definitions; ATIS p-ANI resources
Because p-ANI is non-dialable, it is not simply another phone number to call back. In emergency services, its value can be in the routing or location meaning assigned to it.
Rank #4
- [13 Speed Dial Keys] - With 3 dedicated memory keys to do one touch dialing to your 3 favorite numbers. Additionally 10 more numbers for two touch dialing using the number keys on keypad.
- [Display dialing & Last Number Redial] - The redial button help to dial the last number swiftly. Telephone numbers in the Caller ID log can be dialed with the touch of a button.
- [Caller ID / Call Waiting] - See who is calling with caller ID / call waiting. The handset displays the name, number, time and date of incoming calls. Stores 80 call record entries. For the Caller ID to function, three Alkaline AA batteries (not included) are necessary.
- [No AC Power Required] The Line-power mode enables you to connect to the world without any dependency on power at your premises. Standby time over one year & talk time over 6 months. Handset will indicate low battery when required.
- [[Easy Wall Mountable] This phone was designed to easily hang on the wall of your home and office so that you can keep on doing your activities and be able to take the call when required.
How is ANI different from CNAM and SHAKEN?
These terms describe different pieces of telephone identity and signaling:
Quick Recap
Best Value
- UNSURPASSED RANGE: Experience the best in long-range coverage and clarity, provided by a unique antenna design and advances in noise-filtering technology
- ANSWERING SYSTEM: This reliable cordless system includes a digital answering machine that can record up to 22 minutes of incoming messages, outgoing announcements and memos, and a voice-guide for easier set up
- SMART CALL BLOCKER & CALLER ID ANNOUNCE: Say goodbye to unwanted calls. Robocalls on your landline are automatically blocked from ever ringing through - even the first time. You can also permanently blacklist any number you want with one touch on the dedicated key on the handset. The call block directory can store up to 1,000 name and number entries. Plus, the handset announces the name of the caller, so you can decide to answer the call or block it - screening calls has never been easier
- LARGE 2-INCH SCREEN, BIG TEXT, LIGHTED KEY PAD: High-contrast text on the extra-large 2 inch screen makes it easy to read incoming caller ID or call history records. Plus, the enlarged font and extra-large and lighted handset keypad allows for easy dialing in low-light conditions. This feature is helpful for those who are visually impaired
- HANDSET SPEAKERPHONE, AUDIO ASSIST, INTERCOM: This cordless system has built-in full-duplex speakerphone on handset allowing both ends to speak - and be heard - at the same time for conversations that are more true to life. Also designed with useful features like Audio Assist and handset intercom to help make your daily communications enjoyable
- ANI identifies the billing account or associated number for a call; in 911 systems, it may identify the caller and support a callback.
- CNAM is caller-name information obtained through database lookup. A carrier may query a CNAM database to retrieve a name for display; that is distinct from ANI’s billing-account identification. Twilio CNAM documentation
- SHAKEN is a framework for cryptographically authenticating telephone identity information in IP voice networks. It addresses whether identity information is authenticated, not ANI’s basic definition. FCC call authentication and SHAKEN
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
