Free DID Providers :

• ipkall.com (DID for USA)
• ipstar.us (DID for UK)

Paid DID providers:

• http://www.virtualphoneline.com
• http://www.callnigeriaonline.com
• http://www.didww.com/
• http://www.junctionnetworks.com/index.php
• http://didx.org/
• http://www.opentelcom.com/
• http://www.broadvoice.com
• http://www.callpacket.com
• https://www.stanaphone.com/
• http://www.voiptalk.org
• http://www.messagenet.it/voip/

We are recommending these DID providers without any obligation on our part. These list are just for reference.