Free Incoming DID numbers

FreeDigits and related Sites (US, Iowa numbers):
http://www.freedigits.com/
*NOT ACCEPTING NEW REGISTRATION
VOIP Phone Service Providers, Broadband Business Phone, Free Internet Phone Service VOIP,Voice Over Internet Phone Service (All the URLs below now forward to FreeDigits)
http://www.talkdigits.com/
http://www.calldigits.com/
clickdigits.com
http://officedigits.com/
-Can be forwarded to any SIP URI

http://www.faxdigits.com/ (offers Incoming Fax Numbers)
www.sipnumber.com (Signup currently not working)
http://www.ringtonumber.com This service is a shared number, with an extension for each user. They claim that now though you can forward for free to your own phone number.

Note: Numbers have been available on and off


IPKall (FREE IP Calling with IPKall) (US, Washington State numbers: 206, 253, 360, 425)
http://www.ipkall.com/
How to use: SIP URI Forwarding

GrandCentral.com by Google (GrandCentral: The New Way to Use Your Phones) (US Numbers)
*NOT ACCEPTING NEW REGISTRATION or NEW INVITES AS OF 11/22/2008*
-You get a US number (just about any state)
-You need a US/Cad number to complete the verification
-If you live outside North America you may need a proxy to complete the registration, or have a friend in NA set it up for you (mixed info on this)
-You can set it to forward to up to 6 different numbers (US or CAD numbers only)
-You can have it ring your Gizmo Number (1-747)
-You can have personalized Voice messages for your contacts, by groups, individually, etc.
-They have CallMe buttons, so someone can ring you up from the web: They enter their number, it calls them, calls you, and you are talking.
-Free calls and forwarding to US/Canada
-It is still in beta and everything right now is free.

How to Use: Forwards directly to your US/Cad/Gizmo number

GoogleVoice (http://www.google.com/voice)
*Currently open only to current GrandCentral users
-The rebranded GrandCentral service
-All same services as GrandCentral
-Has Voice to Text transcription for Voicemail
-Can send and receive SMS messages
-Forwards and calls to US are free, whereas there is a cost for Canada and elsewhere
-Has option to call your GV number and call out using the service
How to Use: Forwards directly to your US/Gizmo number

OrbTalk (PAYG | Orbtalk)
http://www.orbtalk.co.uk/free-number/
-Real geographic UK numbers just about everywhere in UK including London 020 7 numbers.
How to Use: ATA or VoXalot/PBXes/MySipSwitch

Coms (Broadband Phone Service Coms - Internet Telephony service provider, Global and Residential VoIP)
http://personal.coms.com/
-Free Real UK Geographic numbers
-Free 0845 Numbers
-Find yourself a real UK address before registering, they seem to check the postal code (this helped me Bedfordshire pubs and bars; pubs in Bedfordshire # beerintheevening.com)
How to Use: ATA or VoXalot/PBXes/MySipSwitch

MessageNet (Messagenet Fax VoIP SMS)  http://www.messagenet.it/
-Real Italian numbers in Rome, Milan and Turin, and free 020 London, UK numbers
How to Use: ATA or VoXalot/PBXes/MySipSwitch

EuteliaVoip-Formerly Skypho (EUTELIA) http://www.euteliavoip.com/
-Free real numbers in most of Italy
-Free real numbers in most of UK
-Free real numbers in Bucharest, Romania +40-21 range (however the Romanian numbers are buggy from my experience)
-Good news is that you can get up to 15 different numbers, but each of them needs to be registered on its own so you need either 15 different lines on an ATA or a place like VoXalot/PBXes/MySipSwitch to have them all pointed to one place. I have been using MySipSwitch for these with good results pointing them to my current VSP.
How to Use: ATA or VoXalot/PBXes/MySipSwitch (see note)

BlueSip (blueSIP - Business Class VoIP)  http://www.bluesip.net/
-Free Munich, Germany number (format +49 89 72xxxx xxxxx)
-Complete registration, be aware that the username to use for registration is of the format bluesip/user
How to Use: ATA or VoXalot/PBXes/MySipSwitch

Hol (www.hol.gr)
***FREE NUMBERS FROM HOL ARE NO LONGER AVAILABLE***
-Free real number in Athens, Greece (+30-213 range) or Thessaloniki (+30-231)
-To Register go to: http://public.curbas.hol.gr/register...-register1.cgi
-As you're going through registration, at the top of the page, you'll see an option to have the registration form in English
-They are picky about the password you choose (it must have a symbol: #$% and a letter at least)
-You'll then receive an email with a link to continue the regitration further.
-To login Go to https://myaccount.curbas.hol.gr/auth/login.cgi
-Once logged in click on the RED MyAccount bar on the side of the page
-Near the bottom of the page you'll see eVoice basic (get User/Pass you need to SIP Register)
-The server is evoice.hol.gr
-I had success using them with PBXes (not tried VoXalot/MySipSwitch)
How to Use: ATA or VoXalot/PBXes/MySipSwitch (see note)

VoipUser (VoIP IpNumber)
http://www.voipuser.org/mynumbers.html
-Free UK Non-Geographic numbers 0844 0871 0870 0703
-(The caller pays a premium rate for these, for a good explanation of what these are all about check here UK Non-Geographic Numbers with free delivery to VoIP (SIP) .: Simwood :.)
How to Use: ATA or VoXalot/PBXes/MySipSwitch or SIP URI forwarding

Acanac (Free Voip Service)  http://www.acanac.ca/Free-Voip.htm
-Free Canadian DID numbers, offer has been available On and Off, worth checking if it is up...

FreePhoneline (Free home phone service from Free Phone Line) (Canadian Numbers)
http://www.freephoneline.ca/
-Free Toronto/Montreal Numbers (If not available, check the next day)
-Can be set to ring either on your computer with their softphone, or forwarded to selected Canadian phone Numbers
-Using their SoftPhone you can place free calls to select Canadian cities
-For more discussion see: FREE HOME PHONE LINE for the first 5000 Residents from Toronto or Montreal - RedFlagDeals.com Forums


Other
Although you'll get a number here, most of them have no SIP connectivity

eSMS (PureNumber - Free UK phone numbers)http://www.purenumber.co.uk/
-Free UK Non-Geographic Numbers: 0844 0871 070.

OpenTelecom (OpenTelecom - Products and Services)
http://www.open-telecom.co.uk/products-and-services.html
-Free UK Non-Geographic Numbers: 0844 0845 0871 070.
-Takes them a while to reply, and depending on the number you choose, you can forward it to various destinations (you may want to get a UK geographic number first from OrbTalk, and have this numbers forwarded there, since OpenTelecom does not seem to support SIP URI forwarding).

IPStar (FREE 0870 uk did) http://www.ipstar.us/
-Free UK Non-Geographic Numbers: 0871 0870

UKNumber (uknumber.co.uk - Giving you a free UK phone number - wherever you are in the world!)
-Free UK Non-Geographic Numbers: 0844 0870 070

UKNumber4U (UKnumber4U - Get a UK virtual phone number anywhere in the World Totally Free, Free Call Forwarding, UK presence, Free UK numbers, UK virtual phone, Hide your real number, Date In Safety)

UKNumbers (UKNumbers.com - All UK numbers and diverts are free!)
-Free UK Non-Geographic Numbers: 0844 0870 0871 070