Phone Numbers

Phone numbers allow callers from any phone to be able to call in. Phone numbers can be attached to users, groups, apps, and resources (except to another inbound OnSIP phone number). When you create a phone number, you can select the area code and region. The last 4-digits are randomly selected from our pool.  OnSIP does not offer local or toll-free vanity numbers.  

How to Buy a Phone Number

*Phone Numbers (DIDs) are only available to billable Plans; Free Plans can not purchase DIDs.

  • click Resources tab 
  • click Create New Resource



  • select Phone Number - there's an indication on this page if you have enough funds to buy a phone number as well as how much each phone number will cost
  • select Create a New Phone Number


  • from the dropdown select the Area Code (first 3 digits)
  • from the dropdown select the Rate Center (next 3 digits)
    *OnSIP does not offer local vanity or toll free DIDs.  The last 4 digits are randomly pulled from our pool of numbers and cannot be previewed prior to purchase.*
  • select a Destination
  • Block Calls Without Caller ID = select ONLY if you wish to block all inbound calls that do not have a listed Caller ID
  • Note: this can be left blank or you can put your own notes here
  • lower right Confirm



The new Phone Number (DID) is now listed in your Resources; it is not readily displayed:

Phone numbers

Assigning Phone Number Destination

If you wish to change the destination of your phone number(s), clicking on the phone number, then  "modify" allows you to choose which user, application, group or resource you want the phone number to be attached to. You can also assign a phone number from within the "Extensions & Phone Numbers" detail panes of any User (User tab), Application (Apps tab), Group (Group tab) or Resource (Resource).  Typically it's easier to assign the destination directly from the Resources tab.

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