Siemens Information & Communication Networks, Inc.

Siemens Communications, Inc.

Mark Clark

Mark Skrzynski

Markku Korpi

Paul G Mayer

Florian Twinkwalder

Florian Trinkwalder

Eddie Lo

A processing system () implements a translator () and a compiler () for compiling a machine readable language. When a source file () is provided, the system performs a line-by-line compare to determine if the file contains extended grammar constructs (e.g., X.68x, where x is greater than or equal to 1) of the language, such as an ASN.1 standard language. If not, then the source file () is complied. If so, however, then the source file () is input to the translator () to translate into basic grammar constructs (e.g., X.680).

Method for adding extensions to the grammar for ASN.1 without modifying the basic compiler and code generator

A supplementary service, such as H.450 in a specific embodiment, test client is provided. The H.450 test client can send and receive H.450 application protocol data units in any H.225 message. The test client allows for the setting of desired H.450 parameters and allows for the display of the H.450 message itself.

System and method for analyzing and generating supplementary service data units in packet based multimedia communications systems

A system and method in an H.323 network for automatically reestablishing signaling that was interrupted due to gatekeeper failure. Primary and secondary gatekeepers ( ) establish a supervisory link ( ) with one another while the media connection is set up between client terminals ( ). The primary gatekeeper ( ) also establishes the H.225/H.245 signaling between the client terminals. If the primary gatekeeper ( ) fails, the H.225/H.245 connections go down, but the media connections will continue. The secondary gatekeeper ( ) than takes over the call and sends a message to its zone's clients that the H.225/H.245 connections need to be reestablished. Further, the secondary gatekeeper ( ) sends a message to the other zone's gatekeeper (if any) of what has occurred. The clients then reestablish the H.225/H.245 channel by using the original setup message with a new Reestablish parameter. The receiving client receives the message, re-establishes the signaling connection and continues using the existing media channel for the media stream of the call.

System and method for restarting of signaling entities in H.323-based realtime communication networks

Endpoints, such as clients and gateways, maintain local codec priority lists ( ), receive remote codes priority lists ( ), and maintain common communication attribute priority lists ( ). When opening a transmittal channel, a local endpoint determines the highest priority codec on its local priority list ( ) that is also on the remote priority list ( ). The local endpoint also determines the highest priority codec on the remote priority list ( ) that is also on the local priority list ( ). If the codes types match, then the transmitting channel is opened with that codec. If there is no match, then the common communication attribute priority list ( ) is used, and the local or remote codec that has a corresponding highest or lowest desired attribute is used for the communication.

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Mark Clark