In order to use our service, you must have a device with a static IP address or DNS name that is capable of receiving SIP calls. Some examples include IP-PBXs, SIP Servers, VoIP Gateways and IP-Based IVR systems. When you submit your order, you need to provide us the IP Address(es) or domain name of your equipment. We will then route all of your access numbers (DIDs) to the IP Address that you have provided and call you to perform a test.