ITU Q.2971 D:1999
ITU Q.2971 D:1999 Digital Subscriber Signalling System No. 2 - User-network Interface Layer 3 Specification For Point-to-multipoint Call/connection Control: Abstract Test Suite (ats) And Partial Protocol Implementation Extra Information For Testing (pixit) Proforma For The User Specifies Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma for the user attached to the T[B] reference point or coincident S[B] and T[B] ref