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| Q.2971D : 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 | 
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| ITU-T Q.2971 D was previously numbered as Q.2971 quater during the approval process |  |  |  |  
| In force components |  
| Number 
 | Title | Status |  
| Q.2971D (12/99) 
 | 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 ITU-T Q.2971 D was previously numbered as Q.2971 quater during the approval process
 | In force 
 |  |