A T1 VOIP service is a T1 phone service using Voice over IP to transport calls over public or private IP networks. T1 VOIP lines are used by businesses to provide local and long distance voice service as well as other applications. VOIP T1 service provides increased efficiency through an IP PBX phone system by utilizing IP network access for VOIP calls through a CPE with a voice T1 handoff. This eliminates the need for a traditional T1 phone service or regular phone lines. A T1 VOIP line also offers the same benefits and features as a traditional voice T1, including faster call connection and Direct Inward Dialing (DID). T1 VOIP service is very flexible and can scale quickly with additional bandwidth added. T1 VOIP lines are also known as a Flex T1, Dynamic T1, VOIP PRI, or SIP T1.