See satellite digital audio radio service.

A facility-handled call in which the network interprets the call request signal as an instruction to establish a connection based on previously designated user information.

The Direct Cause is the immediate event, action, or procedure that triggered the reportable incident (i.e., what happened).

1. In computer systems, a permanent communications link that connects directly to a mainframe computer through a terminal controller, usually at binary synchronous (bi-sync) transmission rates.
2. In computer systems, a temporary connection between a microcomputer, i.e., a desktop workstation, and a host bulletin board system or server.

Synonym conductive coupling.

In telephony, a method whereby the signaling circuit E & M leads use the same cable pair(s) as the voice circuit and no filter is required to separate the control signals from the voice transmission.

See detection.

A service feature that permits a user to place information concerning credit card calls, collect calls, and special billing calls into the public telephone network without operator assistance.

A network-provided service feature in which a call originator may, without operator assistance, call any other user outside the local calling area.
Note 1: DDD extends beyond the boundaries of national public telephone networks.
Note 2: DDD requires more digits in the number dialed than are required for calling within the local area.

A service feature that allows inward-directed calls to a PBX to reach a specific PBX extension without human intervention. Synonym network inward dialing.