Q.931 (1998) Amd.2: ISDN user-network interface layer 3 specification for basic call control. Amendment 2. Extensions for the support for the calling line identification authentication.
Amendment 2 to Recommendation ITU-T Q. 931 was produced to meet the need for the implementation of calling line identification authentication (CIDA) as specified in Q.3063 (2022). This amendment contains the modifications to Recommendation ITU-T Q. 931 (1998) in order to accommodate these needs.
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