Exploring the Contrasts of VoIP Phone Services (original) (raw)
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Voice over Internet Protocol, otherwise known as VoIP, has seen a lot of interest and patronage in the 20 th century. This is due to the development of its underlying network infrastructure and internet as a whole. Also, it brings to board a communication system that is much cheaper to use and maintain than the traditional legacy communication system. KNUST boasts of an efficiently functional VoIP deployment over its local network, allowing for users, mainly administrators and other faculty and staff members to make calls over the VoIP system. Though this system is reliable and serves its purpose well, it has failed to fully exploit other capabilities a VoIP system can employ. There is no integration of the Public Switched Telephone Network (PSTN) system, hence users can reach other users when they are away from their IP phones through the VoIP system. The reason for its absence is history of users misusing the PSTN service for long, personal calls. Also, calls to external networks contend for bandwidth on the router, delivering low quality call experience during peak hours. This project addresses all the above issues, with recommendations for future improvements. A proposed design is made for integration of PSTN with the existing VoIP system. This design incorporates control mechanisms to reduce misuse of the service by users. The design also tackles externally made calls, especially to satellite campuses and other universities. The new design passes all simulation tests for ITU-T recommended metrics. It is also low-cost and highly feasible, making it a suitable improvement to be implemented.
Proceedings of the 8th International Conference on Advances in Mobile Computing and Multimedia - MoMM '10, 2010
Modern multimedia communication tools must have high security, high availability and high quality of service (QoS). Any security implementation will directly impact on QoS. This paper will investigate how end-to-end security impacts on QoS in Voice over Internet Protocol (VoIP). The QoS is measured in terms of lost packet ratio, latency and jitter using different encryption algorithms, no security and just the use of IP firewalls in Local and Wide Area Networks (LAN and WAN). The results of laboratory tests indicate that the impact on the overall performance of VoIP depends upon the bandwidth availability and encryption algorithm used. The implementation of any encryption algorithm in low bandwidth environments degrades the voice quality due to increased loss packets and packet latency, but as bandwidth increases encrypted VoIP calls provided better service compared to an unsecured environment.