SIP.US redundant network utilizes only tier-1 upstream provider to route our SIP traffic. Powerful self-service controls put you in control by providing an easy to use interface that lets you manage all aspects of your SIP account including adding or changing users services and reviewing or exporting real-time call data records. You can bring your own bandwidth, unlike other SIP providers that require you to get bandwidth from them, we offer you the flexibility to choose the bandwidth supply you prefer.