Status of This Memo This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. Abstract This document lists the essential requirements for real-time Text-over-IP (ToIP) and defines a framework for implementation of all required functions based on the Session Initiation Protocol (SIP) and the Real-Time ...

The Session Initiation Protocol and H.323 dominate the Voice over IP world. These signaling protocols are responsible for call setup and call tear down by IP telephony solutions. This project analyses and discusses the underlying H.323 and SIP interoperability issues and intends to build a scalable solution for the interoperability of these protocols. The gateway maps the call sequences between...

The falling trend in the revenue of traditional telephony services has attracted attention to new IP based services. The IP Multimedia System (IMS) is a key architecture which provides the necessary platform for delivery of new multimedia services. However, current implementations of IMS do not offer automatic scalability or elastisity for the growing number of customers. Although the cloud com...

Video telephony is an important application. It is extremely challenging to deliver good user Quality of Experience (QoE) over the best-effort Internet. In this paper, we summarize our previous work on measurement study of commercial video telephony solutions and outline our current and future work on assessing and improving user QoE of video telephony. 1 Background and Motivation The Internet ...

IP networks have been becoming more popular communication infrastructures due to the lower operational costs in recent years. Mainly, usage of IP networks in voice services, which is denominated by VoIP (Voice over IP), has made difference in telephony networks not only the way of the people’s communications, but also telecommunication companies’ and operators’ solutions. In this scope, IMS (IP...

This document gives an overview of Voice Over ATM/Voice Telephony Over ATM (VTOA). It concentrates on various design considerations that need to be addressed while setting up a voice supporting ATM network. It discusses the standards that are getting evolved thanks to the works of ATM Forum. The document ends with brief description of some of the products currently available for VTOA. See Also:...

This paper presents first experimental results for an IP telephonybased steganographic method called LACK (Lost Audio PaCKets steganography). This method utilizes the fact that in typical multimedia communication protocols like RTP (Real-Time Transport Protocol), excessively delayed packets are not used for the reconstruction of transmitted data at the receiver, i.e. these packets are considere...

Status of This Memo This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. Abstract This document lists the essential requirements for real-time Text-over-IP (ToIP) and defines a framework for implementation of all required functions based on the Session Initiation Protocol (SIP) and the Real-Time ...

As current Voice-over-IP (VoIP) systems encourage a direct communication between the callees they are similar in design to peerto-peer (P2P) approaches. Therefore, we introduce a framework to build distributed supplementary services for VoIP. Some of these services like completion of calls on no reply or holding are already commonly established in public switched telephone networks or realized ...

This work presents a Call Admission Control (CAC) system for a SIP-based IP Telephony platform. Configured for a multi-branch enterprise environment, the system enables international calls to be established in two steps: one step using Voice over IP (VoIP) through the Internet between the local office and a VoIP-PSTN gateway placed at destination country, and a second step by means of PSTN, fro...