"Private Integrated Services Network (PISN); Inter-Exchange Signalling Protocol; Call Transfer Supplementary Service for the VPN ""b"" Service Entry Point; Part 2: Abstract Test Suite (ATS) and Partial Protocol Implementation eXtra Information for Testing
"The present document specifies the Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma for the VPN ""b"" reference point of implementations conforming to the standard for the Call Transfer supplementary service (SS-CT) as described in ETS 300 261 [1]. EN 301 490-1 [3] specifies the Test Suite Structure and Test Purposes (TSSTP) related to this ATS and partial PIXIT proforma specification."