All OnSIP services are billed in advance. You have two separate ongoing balances as an OnSIP customer:
- Services: Monthly charges for your application services or per-user charges
- PSTN (Prepaid): Pay-as-you-go calling credits and per-phone number charges as well as toll-free inbound and international dialing
You can view your Services/Per-user balance by navigating to the "Account" tab, and then clicking on the "Configure account packages" link underneath the "Packages" heading.
PSTN (Prepaid) refers to your pre-paid calling balance which must remain above $0.00 to make and receive calls to/from the PSTN.