T1, T-1, DS1, DS-1, T3 Line Connection Service: Internet, Data & Voice by Persimmon Telecommunications - T1 Voice line, T1 Internet access and T1 Service Glossary/Definitions. Free quotes for T1service. Also, Real Time quotes for T-1 Voice, T-1 Internet Service and Integrated T-1, T-3 and DS3 services.