SIP (Session Initiation Protocol) is becoming the mostly deployed signaling protocol for VoIP (Voice over IP). Security is of utmost importance for its usage due to the open architecture of the Internet. Recently, Yoon et al. proposed a SIP authentication scheme based on elliptic curve cryptography (ECC) that claimed to provide higher security than other schemes. However, as demonstrated in thi...

— Convivo is a VoIP system designed to provide reliable voice communication for poor quality networks, especially those found in rural areas of the developing world. Convivo introduces an original approach to maintain voice communication interaction in the presence of poor network performance: an Interface-Adaptation mechanism that adjusts the user interface in order to reduce the impact of hig...

Due to the emergence of innovative technologies over Internet, the traditional broadcasting of TV is changed to use IPTV for next generation networks. IPTV is the delivery of multimedia content to multiple subscribers through multicasting over well known IP. The IPTV depends on the Internet and telecommunications. Therefore, the inherent issues are to be identified and resolved for the success ...

In Voice over Internet Protocol (VoIP) system, the speech signal is degraded when passed through the network layers, since the best effort policy based IP network leads to the network degradations including delay, packet loss jitter. The transmission of voice over internet protocols requires signal processing for reliable & efficient performance over the communication platform. The work in this...

The Voice over Internet Protocol (VoIP) is designed for voice communications over IP networks. To use a VoIP service, an individual only needs a user name for identification. In comparison, the public switched telephone network requires detailed information from a user before creating an account. The limited identity information requirement makes VoIP calls appealing to criminals. In addition, ...

Spam over Internet Telephony as the distribution of unwanted voice messages over Voice over Internet Protocol networks is an upcoming threat. It is harder to prevent than e-mail spam since its content is not available before the victim is annoyed. This is even more difficult if the spam is sent directly to the victim’s user equipment, bypassing the proxies of the service provider. Hence, this m...

Spam over internet telephony (SPIT) refers to all unsolicited and massive scale attempts to establish voice communication with oblivious users of voice over internet protocol (VoIP) services. SPIT exhibits a significant increase over the last years, thus developing into a serious threat with adverse impact and costs for the business economy. An audio completely automated public Turing test to t...

5G technology is spreading extremely quickly. Many services, including Voice Over Internet Protocol (VoIP), have utilized the features of to improve their performance. VoIP service gradually ruling telecommunication sector due its various advantages (e.g., free calls). However, wastes a substantial share network’s bandwidth lengthy packet header. For instance, header from and channel time reach...

Voice networks evolved from the fixed traditional telephone system, to mobile and wireless networks and now towards a converged voice and data infrastructure. This convergence is based on the spread of the Internet Protocol, where VoIP is developing. Due to IP network characteristics, hackers are able to compromise and take control of different aspects of IP telephony such as signaling informat...

Multimedia real-time session services, such as voice and videoconferencing with Quality of Service support is challenging task on Mobile Ad hoc Network (MANETS). For providing multimedia services and Voice over Internet Protocol in MANET, support for Session Initiation Protocol ( SIP) is essential .The goal of QoS provisioning is to achieve a more deterministic network behaviors, so that inform...