ETISL is a revolutionary technology that has the potential to completely rework the world's phone systems. ETISL is basically a clever "reinvention of the wheel."

Although pricing for IP Telephony is typically 30 – 40% below legacy Telco offerings, features and enhancements for IP-based PBXes are the key considerations in the deployment of SIP Telephony for corporate customers. Some features resolve multiple issues related to large-scale enterprise deployments, such as fail over, On-Demand provisioning of lines, DIDs and toll free numbers, and geographic abstraction of local DIDs.

Generally IP telephony services took a wide variety of forms which can be more or less similar to traditional Plain Old Telephone Services. ETISL uses an analog telephone adapter (ATA) may be connected to the broadband Internet connection and an existing telephone jack in order to provide service nearly indistinguishable from traditional phones on all the other jacks in the residence.