ABSTRACT: Electronic Key Telephone Service (EKTS) allows a user served by an Integrated Services Digital Network (ISDN) interface to have access
to multiple Directory Numbers (DNs). A given DN can also be accessed by more than one user, i.e., from more than one terminal, on the
same ISDN interface and/or on different interfaces. Two or more users with access to the same DN can be simultaneously bridged onto
the same call on that DN. In addition, EKTS allows for the following capabilities: hold, DN-bridging, intercom calling, abbreviated or
delayed ringing treatment on incoming calls, station ringing transfer, automatically or manually invoked bridged call exclusion, and
call appearance call handling.
This document contains the Telcordia view of generic requirements for the Integrated Services Digital Network (ISDN) Electronic
Key Telephone Service (EKTS).
Revision is structured as a "section-for-section" replacement to Issue 1 of the GR and adds or corrects specific text and generic
requirements in the document. The revisions may consist of editorial or technical corrections with the primary focus on Section 3,
GR-205 replaced TR-TSY-000205 and TR-TSY-000205-SUP01.