Numerical List of EXS API Messages

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The condition of a component at a given instant. The current "context" of a PPL object, such as Idle, Seizing, Answered. In PPL files, a State is represented by a circle.

Quick depress and release of the phone plunger of a handset to signal the PBX or Centrex of instructions to follow (e.g., Call Transfer).

Range of channels provided by T1 or E1 transmission service. A physical span is a group of channels taking up a single physical wire. A logical span is a group of channels taking up less than a single logical wire, or carried over more than one physical wire.

Outgoing call setup during real-time call processing on a specific channel.

RFS. A Status Message indicating that some entity is requesting service from the Excel platform.

Pattern of tones and silence, such as a busy signal.

See Programmable Protocol Language.

A condition that, when met, drives a state machine from one state to another. A condition that drives a Component out of its current state by invoking an associated primitive.

See Common Channel Signaling.

See Signaling System Number Seven.

Link that connects to the same node

See Integrated Services Digital Network.

See Circuit Identification Codes.

See Integrated Services Digital Network User Part.

A computer, attached to the Excel platform through an RS-232 or Ethernet link, from which you run the telecommunications application that controls the Excel platform.

Excel's open architecture, proprietary, 1.3 Gbps fiber optic network using a packet-based protocol.

See Transaction Capability Application Part.

Digital communications link - voice, data, and video at a 1.544 Mbps rate (24 64 Kbps channels)

Setting up, monitoring, and tearing down calls.

Digital Signal Processor

Data channel. One of two fundamental components of an ISDN interface, it provides a path (16Kbps for BRI, 64Kbps for PRI) for carrying control signals and call data in a packet-switched mode.

Bearer channel, 64Kbps (ISDN) The channel that carries the actual payload (as opposed to D-channels, which carry signaling data that helps route the payload).

Message delimiter (SS7 bit pattern - 01111110)

A digital communications link - voice, data, and video at a 2.048 Mbps rate; 30B/2D or 31B/1D (ISDN); non-North American version of T1.

See Pulse Code Modulation.

Internet Protocol. Part of the TCP/IP family of protocols used to route messages and tracks the addresses of nodes.

A 32-bit address, used in IP routing, which includes a Network address identifier assigned by a central authority and a Host ID (an end station identifier assigned by a LAN administrator).

Voice over Internet Protocol. The delivery of voice information in digital form in discrete packets rather than in the traditional circuit-committed protocols of the public-switched telephone network (PSTN).