Abstract
In the session initiation protocol (SIP), payments have been proposed as a way for vendors to obtain profit from the services they provide. Payments in SIP have also been proposed for microbilling and even as a solution to SPAM in VoIP systems. Although several proposals exist for making payments in SIP, they present some limitations when we want to pay for access to real-time services: either they are not suitable for micropayments or they do not consider security in the payment information exchanged. As a response to these limitations, we propose a new SIP payment protocol, LP-SIP, that supports the payment according to different models like pay-per-time, session-based, etc. It also performs payments in SIP efficiently and takes into account the secure exchange of payment information, unlike other existing proposals. Thus, we provide a lightweight payment protocol that can be used for the payment of real-time services.
Highlights
1 Introduction Many multimedia services rely on session initiation protocol (SIP) [1], which is a cornerstone of the generation networking and IP multimedia subsystem
There are two kind of solutions for charging these services: those based on authentication, authorization and accounting (AAA) infrastructures such as those based on RADIUS [2], Diameter [3] or SIPA/SIPA+ [4] and those based on SIP-based payment mechanisms such as Fischl and Tschofenig’s proposal [5], SIMPA [6], SIPCoin [7], Fan’s et al protocol [8], or Zhang’s et al protocol [9]
2.1 SIP The SIP [1] is a protocol designed to help in the creation and management of multimedia sessions such as a voice over IP call, a distributed conference, an instant message conversation or, in general, every type of data communication between peers, called user agents. 2.1.1 Session set up SIP uses a three-way protocol to carry out the session set up, unlike other SIP functions that are based only on the request-response pattern
Summary
Many multimedia services rely on session initiation protocol (SIP) [1], which is a cornerstone of the generation networking and IP multimedia subsystem. The main drawbacks of these proposals are that they are either not suitable for micropayments or they do not consider the secure and efficient exchange of payment information Another approach that we could have followed was the integration of some of the existing protocols. This approach has two drawbacks: these micropayment protocols do not consider the confidentiality of the payment information exchanged and they use asymmetric cryptography in the payment phase [13,14,15,16], which is not suitable for real-time transactions due to the computational costs of these operations. A payment protocol that supports making the payment of real-time services based on SIP should satisfy two main requirements.
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