ITU Q.2920:2003 Broadband Integrated Services Digital Network (b-isdn) - Digital Subscriber Signalling System No. 2 (dss 2): Call/connection Control For The Support Of Atm-mpls Network Interworking Defines extensions to DSS 2 information elements and procedures to allow the exchange of MPLS LSP labels and other parameters specific to support ATM services over MPLS networks.