T1.401.03-1998 (R2003)

Network-to-Customer Installation Interfaces - Analog Voicegrade Switched Access Lines with Calling Number Delivery, Calling Name Delivery, or Visual Message-Waiting Indicator Features

This standard provides the signaling and data transmission requirements associated with the Calling Number Delivery (CND), Calling Name Delivery (CNAM), and Visual Message-Waiting Indicator (VMWI) features when one or more of these features are provided on an analog voicegrade switched access line. When the network provides the CND feature, the CNAM feature, or both the CND and CNAM features, an on-hook customer installation (CI) receives analog frequency-shift-keying (FSK) data messages that identify the caller's number, the caller's name, or both the caller's number and name. When the network provides the VMWI feature, an on-hook CI receives FSK messages that activates or deactivate a CI visual message-waiting indicator.