Order a DID Number
From VoIP.ms Wiki
DID (Direct Inward Dial) Numbers are used to receive incoming calls. These phone numbers can be called from any phone, including mobile phones and payphones. So whether you are a local, national, or global business, you can use your DID numbers.
You can order a DID Number at your Customer Portal>> Manage DID>> Order DID.
There you can find the following options:
Local Numbers: You can choose numbers from USA and Canada.
Toll Free Numbers: You can choose TF from US, Canada, US+Canada and international numbers
iNum DID's: It is a global phone number, it doesn't belongs to a particular country, or even a particular city.
National Numbers (Non Geographical). These numbers belongs to a particular country but not to particular city.
Virtual SIP Numbers: These numbers can only be reached via "SIP URI" over internet.