Intended audience (VoIP Protocols)

The intended audience for Beyond VoIP Protocols is:
• Network planning teams, in charge of buying transport capacity, who need to guarantee acceptable end-to-end transmission delays.
• RFI/RFP technical teams who want to evaluate IP access devices (e.g., DSLAMs or BASs). The proper support for per-stream quality of service becomes fundamental in such equipment.
• Technical support teams for marketing departments who want to evaluate the cost side of ‘triple-play’ business models, which depend on the required bandwidth at the access level, as well as the sizing of control softswitches and gateways.
• National telecom regulators who want to evaluate the impact of IP wholesale prices on the viability of competitive VoIP service providers or want to assess the credibility of the threat of ‘virtual service providers’ (e.g., Vonage in the US), using an existing DSL local loop to provide telephony services without a license. Regarding numbering issues, the topic provides strong arguments in favor of dedicating specific number ranges to VoIP (the solution adopted in Japan and many other countries), in order to avoid IP to TDM to IP connections, which obviously exceed acceptable delay constraints and introduce unwanted codec tandeming.
• Telecom students who want to understand how to use classic telecom tools in the context of VoIP. The topic also provides an overview of many of the active research areas related to multimedia over IP and can help select a ‘hot’ topic for a thesis.
All the topics in Beyond VoIP Protocols are relatively independent. They have been ordered from the most voice-centric to the most network-centric, but the reader can skip the topics they are not interested in. For instance, if you are comfortable with considering voice coders as ‘black boxes’, you may skip topic 2 (or read the higher level description in topic 1 of IP Telephony: Deploying Voice-over-IP Protocols).

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