VoIP DID Providers

VoIP DID providers offer direct inward dialing (DID) numbers to companies specializing in VoIP services, such as ITSPs, VoIP providers, wireless operators, calling card companies, and local exchange carriers (LECs).


VoIP DID providers supply direct inward dialing numbers (DIDs) to firms providing IP telephony services to other VoIP companies and consumers. DID VoIP providers are typically wholesale VoIP providers, offering other services that include carrier services with flexible routing, international distribution, multi-platform call forwarding, and broadly distributed POPs.

VoIP DID Providers Listing


3Stars Net

Limited amount of free numbers available in Belgium. DID's available from over 30 countries

Broj Services - Croatia DID numbers


Call Packet - Free DID in West Coast USA


DID's and Tollfree number from 91 countries


Doretel - DID's to over 50 countries


enum2go - free enum enabled global numbers

eNum is a unique number that you can have for life which will hold all your underlying contact details, no matter how often they change and can be used for any type of communication service including voice, instant
messaging, email and multimedia communication.

eSMS - Free UK numbers

Simwood eSMS provides UK telephone numbers which can forward calls anywhere in the world. We offer every UK prefix from 0800 freephone, through 0870 national rate, to every local area code so you can be associated with any town or city in England, Scotland or Wales.

Free DID's in Italy - Milan,Rome,Turin

Servizi gratuiti e professionali: FAX [invio dal Web o dalla propria email e ricezione nella casella di posta] e telefonia VoIP con numerazione geografica. SMS online con ricevute di consegna real-time gratuite e risposte sul web o sul cellulare.

GossipTel - FREE UK PSTN number


IPKall - Personal Washington State (USA) number

IPKall is the service that lets you receive FREE calls over the Internet from any phone, anywhere, any time.

Who Uses DIDs?

VoIP DID providers offer wholesale DID VoIP provisioning services to businesses such as:

  • ITSPs
  • Wireless phone companies
  • Calling card companies
  • VoIP service providers

A direct inward dialing (DID) number is a unique phone number.

Some DID providers also offer virtual number provision directly to individual businesses and consumers. DID VoIP services to consumers offer the opportunity to buy low-volume or even single virtual numbers in numerous domestic and international calling areas, so that far-flung customers, friends, and family can call local numbers for little or no cost. Those virtual numbers can then forward calls to a variety of terminal choices, including:

  • Skype/VoIP/Google Talk numbers/phones
  • Landlines
  • Cell phones

VoIP DIDs can also support a number of different protocols, such as:

  • SIP
  • H.323
  • IAX

Traditionally, DID providers were competitive local exchange carriers (CLECs) such as WorldCom, and offered volume DID purchasing only to large-scale carriers such as AT&T and Sprint. More recently, with the increase in small-scale hosted VoIP providers, many VoIP DID providers are offering DID VoIP service with no minimum purchase.

Still other DID VoIP providers such as VoIP Innovations provide sophisticated VoIP DID management as well as provisioning. Recognizing another business opportunity, these types of VoIP DID providers may even offer a wide variety of ways to choose DIDs beyond the rate center availability, such as by:

  • Network (carrier, CLEC, reseller)
  • Feature (T38, CNAM)
  • Tier

DID VoIP providers may also offer the option to purchase DID service by the minute or port, and to incorporate add-on features such as e911, 411, and CNAM (calling name, used for services such as caller ID).

Many DID VoIP providers also offer online DID ordering with very fast — if not immediate — provisioning.

How DIDs Work

A direct inward dialing (DID) number is a unique phone number. An example would be your home phone number, an 800 number, or any of a company's individual phone numbers (not extensions). A phone number is an ID of sorts, and is used to connect to and use the publicly switched telephone network (PSTN).

Residential phone numbers are associated with a pair of wires coming into the home. In businesses with multiple numbers, having each unique number tied to a pair of wires is a logistical nightmare.

DIDs (or DDIs, for direct dial-in, through much of Europe and the South Pacific) evolved as a way of supporting multiple numbers on a small amount of physical lines. DIDs were developed by AT&T in the 1960s, as businesses started relying on private PBXs rather than the telephone company's PBX service. AT&T modeled the organizational system on the German post office's system. DIDs — a local geographic or national telephone number — are used in conjunction with a company PBX, which routes calls internally.

Businesses use a local PBX with a trunk supporting multiple lines, or phone numbers. The trunk is assigned a range of numbers, or DIDs. The PSTN sends calls to those numbers to the trunk, which sends them on to the PBX. The PBX identifies the dialed destination number (DNIS) and sends the call to the right extension. VoIP DIDs use a gateway between the trunk and the PSTN.

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