Depending on the Service Plan you subscribe to, a predetermined number of channels is automatically allocated to an Account. You can, at any time, add more channels to the account. The sum total of number of channels available on the Account will enable all Hosted Voice users/extension to make and receive calls to and from the PSTN network. Internal calls like calls between extension-to-extension does not take up channel usage.
Users are actual users on Hosted Voice and is typically assigned an extension. Each user/extension can make and receive 2 simultaneous calls on their personal account.
Related Topics:
Setting up a Hosted Voice Account
Create a User for White Label Portal