Avaya Inc.

Anupam Rai

Amit Agarwal

Jean Meloche

Lorraine Denby

Akshay Adhikari

David Ahrens

John R Tuck, Jr

Russell C Jones

Rohit Mehta

Rod D Livingood

Rupesh Kumar

Wayne Sam

The present invention is directed to a communication device including a discovery agentoperable to determine an encapsulation method used by a tunnel by transmitting packets generated using different encapsulation protocols until a responsive packet is received on a selected receive port.

Encapsulation method discovery protocol for network address translation gateway traversal

In one embodiment, a communication deviceincludes a voice communication moduleto effect packet-switched voice communications over an untrusted network; a secure communication moduleto create a secured pathwaywith a selected remote secure communication module; and a VPN topology clientto contact a VPN topology serverto receive VPN topology informationthat enables the secure communication module to create the secured pathway with the selected remote secure communication module. The VPN topology information includes IP addresses associated with remote secure communication modules, with each of the IP addresses having a corresponding range of node addresses serviced by the respective secure communication module.

Client configuration download for VPN voice gateways

Techniques for determining a problem location or otherwise characterizing a network comprising a plurality of processing elements, including at least one processing element associated with performance of a packet encapsulation operation of an encapsulation protocol. The packet encapsulation operation is performed on a test packet to generate an encapsulated packet, the test packet having a time to live (TTL) value and an identifier. In conjunction with performance of the packet encapsulation operation, the TTL value and the identifier of the test packet are copied to a header of the encapsulated packet. The encapsulated packet is transmitted, and a determination is made as to whether a reply packet has been received responsive to transmission of the encapsulated packet. The reply packet, if any, is processed to obtain information utilizable in determining the problem location or otherwise characterizing the network. By way of example, these operations may be repeated, for subsequent test packets with increasing TTL values, until an amount of router hop information sufficient to determine the problem location is obtained.

Automatic determination of connectivity problem locations or other network-characterizing information in a network utilizing an encapsulation protocol

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San Jose, CA, United States of America

Anupam Rai