Internet Communications Using SIP : Delivering VoIP and Multimedia Services With Session Initiation Protocol {2Nd Ed.}

Mixed Internet-PSTN Services There are a wide range of interworking modes between the PSTN- and SIP- based IP communication netw ...

Figure 2.5 Mixed enterprise voice systems using legacy PBX, the PSTN, and VoIP. Firewalls and network address translators (NATs) ...

While the approach in Figure 2.5 avoids sudden disruptions to the enter- prise voice services, voice-only users cannot benefit f ...

that can, for example, transcode speech to text and text to speech, or insert video for using a sign language. SIP-based communi ...

Figure 2.6 Desktop SIP phones: (a) Business SIP phone; (b) Consumer SIP videophone (a) Courtesy: snom Technology; AG (b) Courtes ...

number portability, on the Internet such a service is not required in the first place, since URIs have no geographic significanc ...

■■ All ITU-T NG networks (such as ISDN, BISDN/ATM, IMS/NGN/IP) are based on grand designs and are not based on a continuous evol ...

[9] “SIP Extension for Instant Messaging” by B. Campbell et al. RFC 3428, IETF, December 2002. [10] See for example http://www.x ...

[31] “Framework Draft for Networked Appliances using SIP” by S. Moyer et al. http://www.softarmor.com/wgdb/docs/draft-moyer-sip- ...

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39 After the overview on SIP-based IP communication services presented in Chapter 2, we will provide here a brief summary of the ...

Figure 3.1 Circuit-switched network model The main features of circuit switched-architectures such as Time Division Multiplex (T ...

■■ There are single points of failure. Protection against network failures requires carrier-grade equipment (the so-called 99.99 ...

Figure 3.2 IMS reference architecture Courtesy R. Stastny, ÖFEG Besides such features illustrated by the architecture diagram fo ...

The end-to-end argument is discussed in depth in Saltzer [3]. The basic argument is that, as a first principle, certain required ...

Figure 3.3 Internet model The Internet is characterized mainly by the following: ■■ Datagram-oriented instead of circuits. ■■ No ...

Figure 3.4 Packet loss and delay on the Internet Some critical knowledge about the network part of the Internet is still use- fu ...

Table 3.1 (continued) GUIDELINES AND PRINCIPLES DESCRIPTION Layering Considered Harmful The optimization for each layer must be ...

Table 3.1 (continued) GUIDELINES AND PRINCIPLES DESCRIPTION The Myth of Five Nines The Internet can provide better than 99.999 p ...

The Internet Standards Process How are the so-very-successful Internet standards produced? The success of the Internet is attrib ...