Software Overview

The SIP software provides User Agent Client (UAC), User Agent Server (UAS), and Location Server registration functionality. The implementation in this release has the following key attributes and features.

With a Matrix Controller implementation, SIP software is independent of hosts and line cards. This feature enables partners to upgrade to the next generation of SIP software and IP Network Interface cards independently.

UPDF allows for seamless protocol interworking, whether it entails various IP protocols (SIP endpoint to an H.323 endpoint) or IP-to-PSTN signaling.

The SIP software gets the RTP Payload Type and Payload size from the Route Table or Route Control message. If the type and size are not specified in either of those, the SIP software uses the IP Network Interface defaults.

The User Agent communicates with Layer 4 and the IP Network Interface card to perform SIP-controlled operations. The User Agent communicates with Layer 4 over a TCP/IP socket, and uses UDP or TCP to communicate externally with other SIP devices.

SIP software allows a Excel partner application to work with the Excel platform to provide services in the IP Services Node. Existing partners with applications that provide circuit node services can support SIP with minimal application changes.

Session-Initiation Protocol. A signaling protocol used for establishing sessions in an IP network. A session could be a simple, two-way telephone call, or it could be a collaborative multi-media conference session.

In SIP, an application program that sends SIP requests (See also Session Initiation Protocol). Clients may or may not interact directly with a person. Users agents and proxies contain clients (and servers).

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

Universal Protocol Data Format. A predefined data format set used by a line card to communicate to the Layer 4 and above to represent information of the network-side of the line card. This set is independent of the network-side protocol.UPDF offers a "super scale" protocol format for signaling.

See Universal Protocol Data Format.

ITU-T standard defines a set of call control, channel setup, and codec specifications for transmitting real-time voice and video over networks that do not offer guaranteed service or quality of service.

Public Switched Telephone Network

Real-Time Transport Protocol. Supports transport of real-time data like interactive voice and video over packet-switched networks.

Call processing layer of the CSP.

Transmission Control Protocol / Internet Protocol. A networking protocol that provides communication across interconnected networks.