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.
Once you have selected the desired type of number, you have to select the country/state for your DID order (when it applies) and then select a number from the list if they are available, and you will be able to see the charges that will apply for it.
If there is no number in stock available, you could start a back order process and a random number will be delivered on your account after this process is completed.