TR TSY 000578 : ISSUE 1 REV 1

Usage- Sensitive Three-Way Calling (USTWC) allows a customer, by dialing an access code, to request the capability of adding third party ot the two-way connection that is established by subsequent dialing. This new TR is a part of the LATA Switching Generic Requirements (LSSGR), TR TSY-000064. Usage Sensitive Three-Way Calling, FSD 01-02-1304, was previously integrated in TR TSY-000522 of the LSSGR. TR TSY-000522 is now being disassembled into individual Technical References for convenience of purchasing, filing and updating. USTWC requirements in this TR are identical to USTWC requirements published in TR TSY-000522, Issue 2, July 1987. Revision 1 to Usage Sensitive Three-Way Calling, FSD 01-02-1304, provides expanded text regarding AMA recording procedures for Usage Sensitive Three-Way Calls.