The present document specifies the Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information
for Testing (PIXIT) proforma for the VPN "b" entry point of implementations conforming to the standard for the Call
offer supplementary service (SS-CO) as described in EN 300 362 [1].
EN 301 491-2 [2] specifies the Test Suite Structure and Test Purposes (TSS&TP) related to this ATS and partial PIXIT
proforma specification.