This section provides information about how the Data Call Setup feature behaves in certain circumstances. Use this information to ensure that you receive the maximum benefits of Data Call Setup under all conditions. The following considerations apply to Data Call Setup:
ISDN basic rate interface (BRI) has a voice-to-data restriction. A telephone cannot call a data terminal, and a data terminal cannot call a telephone
BRI telephones cannot have data-extension buttons. Digital Communications protocol (DCP) sets have data-extension buttons. However, DCP sets cannot have data-extension buttons for BRI.
When a telephone user uses a modem to place a data call, the user dials the data-origination access code that is assigned in the system before the user dials the endpoint.
The system does not limit the number of assigned data-extension buttons per telephone. Assign telephone buttons that access the data module.
Telephone dialing is unavailable in ISDN-BRI applications because ISDN-BRI terminals supports neither voice-call transfer to data, nor data-call transfer to voice.
