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An autonomous decentralized system and a series of methods for reducing the detection time of path failures in the system are developed. Computing devices in the proposed system are organized into at least three groups based on their connectivity of system's graph model. Each computing device is assigned three identification values associated with their group memberships. The identification values...
For accessing various resources via mobile device anytime anywhere, the heterogeneous access technologies between wired and wireless networks have been developed and integrated actively. However, real-time services, e.g., Voice over IP (VoIP) and video streaming suffer from long delay, and non-real-time connections, e.g., TCP connections, cause low transmission throughput while occurring timeout and...
This paper presents a new type of design method for IP telephony gateway which is base on the soft-switch technology. It designs the hardware circuit with TMS320C5402 as its core and develops a telephone communication protocol which is based on UDP / IP. The Trunk Gateway supports MGCP protocol standards. Besides, it can fulfill lots of functions including audio processing, voice codec, and signaling...
In this paper, the vision and design of a knowledge-base software tool for testing VoIP gateway application are described. The tool is unique in nature in various ways. The tool can be extended easily and dynamically to incorporate more parameters that are relevant in testing a VoIP gateway software or similar applications while also effectively generate test cases. In general, testing a medium to...
Network operators are in the process of adopting the IP Multimedia Subsystem (IMS) as their main underlying infrastructure which will in turn be used as a Service Delivery Platform (SDP). This process requires the migration of current services to their IMS counterparts, as well as a compatibility layer enabling successfull communication between IMS and other network infrastructures. Any and all functionality...
IP-PBX from SETA Company in Japan which is an IP phone switch system based on SIP (Session Initial Protocol), has realized both phone call and other related extensions. At the same time, kinds of incompatible problems concerning SIP phone on their extended functions exist, such as call hold while developing this IP-PBX. The characteristics of both IP-PBX call hold function and other kind of SIP phone...
Based on analysis of the MGCP protocol, a DSP-based simplified MGCP stack running on LAN IP telephony system is implemented. The simplified MGCP stack adopts layered structure and session state machine, and accomplishes some functions such as individual calling, group calling, full calling, amplifying calling, storage and parse for MGCP messages. The simplified MGCP task is created with ??C/OS-II...
Inter-enterprise collaborative environments and applications enable users to utilize and manage voice, data and video services on a common IP-based network. As voice moves from its traditional separate network to having both user and trunk connections traverse the corporate IP network, the demands for uptime and quality of experience increase dramatically. When video-over-IP is layered onto the same...
Deployment of VoIP service brings in security challenges that necessitate additional protection measures for corporate networks. Logging of VoIP sessions between a corporate LAN and the Internet becomes an essential requirement, to prevent misuse, to enforce security policies and to respond to security incidents. Identifying valid VoIP sessions and call tracking from the signaling to media session...
Services and agencies continue to deploy IP SATCOM systems while awaiting migration to the joint IP modem (JIPM). As the JIPM nears production, challenges such as establishing responsibility for development of a common end user terminal, satellite and hub resource allocation and management, and long term sustainment for the end-to-end SATCOM infrastructure must be addressed. Currently, the DoD gateway...
Since the late 90's IP telephony, commonly referred to as Voice over IP (VoIP), has been presented as a revolution on communications enabling the possibility to converge historically separated voice and data networks, reducing costs, and integrating voice, data and video on applications. This paper presents a study over the standard VoIP protocols H.323, session initiation protocol (SIP), media gateway...
One of the vital key elements for providing quality of service (QoS) for VoIP is the call admission control (CAC) capabilities of the session management/call session control function or gateway. Even though the network may be designed to meet a given performance and restoration objective for the engineered traffic loads, the actual traffic may be significantly higher. Without a CAC function in a VoIP...
Advanced feature servers are at the core of enterprise IP telephony, offering traditional services, such as call hold, voicemail and find-me-follow-me. These feature servers have begun to be deployed as IMS Application Servers to support both in-house (premises based) or hosted service (IP Centrex) offerings. At the same time, there exist applications that are external to IMS that can provide a richer...
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