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SIP and payments: a way of controlling the price
KTH, Superseded Departments, Teleinformatics. (CCSlab)
2000 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

IP-telephony is said to be the future of telephony, reducing infrastructure investments and enabling new services. IP-telephony solutions exist already in some business buildings as a replacement for PSTN or on the Internet as IP-to-IP telephony. However, before IP-telephony will be a realistic replacement for PSTN two major problems must be solved though; billing and guarantee of the expected QoS. Without the possibility of revenue no company would like to invest money and without QoS no customer will want to replace PSTN with IP-telephony. IP-to-IP telephony exists with best effort traffic for free today, and it will not be possible to charge for it in the future. By introducing value-added features such as PSTN gateway connection, bandwidth reservation and services such as call screening and redirecting, a way of charging the customer is presented in this report.

The payment solution developed in this thesis is based on SIP and Jalda. The system is built in modules, all with a specific task, hence creating a distributed system, which does not depend on a central part, and following existing standards, avoiding a proprietary solution. It is also general enough to support other types of media than speech, enabling several business ideas including video on demand.

Security has to be considered seriously when dealing with Internet payments. The solution presented contains both the advantages of SIP with authentication and message encryption, as well as authentication and accounting by Jalda. Authorization is not a problem, as no one will get access to the services without paying, and anyone willing to pay will be granted access. It ends up being a distributed payment solution.

SIP has the necessary characteristics for constructing billing solutions. As payment seems to be a solvable problem there remains one major difficulty with IP-telephony. Until QoS can be guaranteed or the interference reduced to a minimum, it is not reasonable to imagine IP-telephony replacing PSTN except in well managed intranets where the network can be over dimensioned in such a way as to provide the necessary QoS.

Place, publisher, year, edition, pages
2000. , 59 p.
National Category
Communication Systems
URN: urn:nbn:se:kth:diva-93538OAI: diva2:516912
Subject / course
Educational program
Master of Science in Engineering - Electrical Engineering
2000-11-16, Seminar room "Telegrafen", Isafjordsgatan 22, Kista, 09:00 (English)
Available from: 2012-06-14 Created: 2012-04-20 Last updated: 2013-09-09Bibliographically approved

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