July 2002
Intermediate to advanced
528 pages
15h 13m
English
Content preview from Practical VoIP Using VOCALBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 18. Quality of Service and Billing
This chapter is a combined view of billing and Quality of Service issues. VOCAL does not include a billing server, but has a Call Detail Record (CDR) server that can either cache billing information or send it via the Remote Authentication Dial In User Service (RADIUS, RFCs 2138 and 2139) protocol to a third-party billing server. VOCAL also comes with an Open Settlement Protocol (OSP) stack that permits different VoIP systems to share billing information for cross-network calling through the use of a common clearing house. OSP is a product of the Telecommunication And Internet Protocol Harmonization Over Networks (TIPHON) project at the European Telecommunications Standards Institute (ETSI),http://http://www.etsi.org.
QoS is an advanced topic: while the protocols and technology exist to ensure some sort of QoS between IP networks, the practice has not caught up to the theory. Some organizations offer point-to-point IP backbones that are useful for VoIP traffic; however, the adoption of packet telephony will have to expand by several orders of magnitude before the business incentives to improve QoS push a truly ubiquitous, reliable service into the realm of practical and affordable reality. In many cases, service providers simply engineer a network to have plenty of bandwidth and ignore per-call QoS.
Although these topics are normally diverse and would normally deserve separate treatment there is, in VOCAL, a commonality that brings these ...
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