A New Wireless VoIP Signaling Device Supporting SIP and H.323 Protocols

Supporting SIP Personal Mobility for VoIP Services

SIP is promising for VoIP signaling to support personal mobility. In this paper, we introduce and compare single registration (SR) and multiple registration (MR) for personal mobility. The SR scheme can not support personal mobility without user’s assistance. In contrast, the MR scheme supports personal mobility inherently using sequential search or pure parallel search. Sequential search may s...

SIP-H323: A Solution for Interworking Saving Existing Architecture

In the 3rd generation multimedia communication world and in the 3GPP standardization consortium, SIP protocol appears to be the preferred signaling protocol. However, the need to communicate with non-SIP based network, e.g. H.323 from ITU-U, is still a reality. The need can be satisfied with the introduction of network gateways (also named Inter-Working Function). One of the open issues about S...

Developing and Validating a New Wireless Wearable Device for Balance Measurement in Sport and Clinical Setting

One of the new clinical techniques to assess the lower body parameters is the wearable ultrasonic sensors. The device which can measure the static and dynamic balance abilities in sport and clinical setting by the traveled signals of ultrasonic transmitter and receiver between two feet was developed and validated. The new device consisted of a pressure gauge and a digital centimeter indicator a...

Securing SIP in VoIP Domain

A Scalable Distributed VoIP Conferencing Using SIP

Session Initiation Protocol seems to be the preferred standard for Voice over IP. In this paper, we consider the limitations of existing SIP conferencing methods and propose a distributed architecture using Controllers (SIP Proxy Servers) and Conference Servers which facilitates the control and media handling of a VoIP conference. The Conference Servers are designed on the basis of H.323’s Mult...