|  |  |  |  | 
|  | Home
		: ITU-T 
		: Publications
		: Recommendations
			  : Q Series
		: Q.2957.1 | Recently posted - 
            Search Recommendations | 
|  |  | 
| Q.2957.1 : Stage 3 description for additional information transfer supplementary services using B-ISDN digital subscriber signalling system No. 2 (DSS2) - Basic call : User-to-user signalling (UUS) | 
| 
|  | 
| Modified by ITU-T Q.2971 (10/1995). |  |  |  |  
| In force components |  
| Number 
 | Title | Status |  
| Q.2957.1 (02/95) 
 | Stage 3 description for additional information transfer supplementary services using B-ISDN digital subscriber signalling system No. 2 (DSS2) - Basic call : User-to-user signalling (UUS) Modified by ITU-T Q.2971 (10/1995)
 | In force 
 |  
| Q.2957.1 (1995) Amendment 1 (12/99) 
 |  | In force 
 |  |