VoIP Clearinghouses and the Open Settlement Protocol
R. H. Brennan, R. P. Swale · Institution of Engineering and Technology eBooks · 2001
VoIP networks become more widely deployed, there is the increasing need to interconnect them. In the early phases of deployment, such interconnections have been dominated by relying upon the existing TDM infrastructure of the PSTN. However, this is unlikely to remain a stable position as the TDM infrastructure itself migrates through natural network evolution away from TDM towards packet-based solutions. Achieving the interconnection of VoIP-based networks using IP technology is therefore an essential element of the VoIP environment in the future. This chapter has discussed a number of issues surrounding such interconnections and has highlighted current protocol developments envisaged to address these needs. In particular, the chapter has presented an overview of both the H.225.0 Annex G and OSP solutions.