Dedicated Internet Access (DIA) Flexible Bandwidth. SLA-backed. Nationwide. Businesses depend on the Internet, but one size doesn’t fit all. At WorldCallTel.com,Inc., we provide a complete set of Dedicated Internet Access (DIA) products allowing for nationwide coverage, flexible and scalable bandwidth, and industry- leading Service Level Agreements (SLAs). We will customize a package tailored to suit your specific business needs. Our DIA solutions include DSL, T1, DS3, OC-X, and Metro Ethernet.