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The new SIP-P2P approach brings many advantages like the improved reliability and the ease of setup. However, Communications Service Providers (CSPs) offering VoIP services seem to be afraid to lose their profits due to the introduction of SIP-P2P. Claimed is the lack of session establishment control leading to revenue leakages. In this work the authors introduce a charging system for SIP-P2P that assures CSPs' revenue from using SIP-based peer-to-peer communications commercially. The proposed solution consists of a new "Carrier-grade P2P network" concept, software modification of existing equipment and gives some charging application design guidelines. An application prototype was implemented to examine the concept. Additionally, experiments were done to provide the methodology for system dimensioning.
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