ITU-T Q.2722.1 specifies the extensions to the Broadband ISDN User Part (B-ISUP) to support point-to-multipoint call/connection control. This Amendment 1 to ITU-T Q.2722.1 has been prepared to enable the use of the modified B-ISUP assignment procedures together with the point-to-multipoint call/connection control. This amendment includes the additional procedures required to support the modified B-ISUP assignment procedures. In addition it contains corrections of editorial errors identified in ITU-T Q.2722.1 since its first publication in 1996.