SIP

Carrier-grade Signalware® SIP provides a complete development and deployment environment for customer-developed applications based on the SIP signaling protocols. This includes the combination of flexible SIP protocol access and platform management features that simplify the development process. Signalware SIP is a robust solution that is built on the same proven fault-resilient platform as Signalware SS7 and SIGTRAN.

Signalware SIP's high availability and scalability distinguish it from other SIP offerings. Features such as multiple computer element clusters and application failover and restart ensure revenue will not be lost due to downtime. Signalware SIP APIs can be added along side of SS7 or SIGTRAN signaling nodes to take advantage of Signalware's proven operational environment. Signalware SIP can also be deployed in a standalone environment, reducing product life cycle costs since one signaling platform supports multiple customer products.

The SIP architecture is modular and provides a simple, easy to use development environment for handling SIP session control. Signalware SIP allows developers to maintain state information at either the transaction level or at the call level. Because it is modularized, the underlying transport protocol (UDP, TCP, SCTP) is transparent from the user application. This transparency hides the communication details so developers can concentrate on the application.

Signalware applications can access the SIP protocol stack using any of the three abstraction levels as shown below: Protocol Function, Transaction Function, and Call Function. In addition, Signalware SIP includes important Routing and Management Functions that support the high availability features of the product.

Protocol Function
The Protocol Function provides low level encoding and decoding of SIP message formats. This is the lowest level that the developer can use to access SIP communications services. Signalware SIP is compliant with the latest IETF standards (RFC 3261, RFC 2327). The SIP library performs SIP parsing of standard requests (INVITE, ACK, BYE, CANCEL, REGISTER, OPTIONS) and responses. Optional SIP extensions (INFO, PRACK, SUBSCRIBE, NOTIFY, UPDATE, REFER, MESSAGE) support 3G wireless requirements for presence, availability and instant messaging services. The protocol function does not reject unrecognized extensions. Any unrecognized data is passed on as raw data to the application for further deciphering. This allows the developer to handle many proprietary extensions or special encoding defined by a SIP extension.

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