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

An important requirement for commercial conference bridges is the capabil- ity to convey with confidence the list of all partici ...

for moving existing participants to the centralized conference. The example provided here also is valid for moving from a two-pa ...

Centralized Conferencing The IETF has a new working group called the Centralized Conferencing Work- ing Group, or XCON [9] that ...

[8] “The Session Initiation Protocol (SIP) Refer Method, RFC 3515” by R. Sparks. April 2003. [9] http://www.ietf.org/html.charte ...

253 CHAPTER 15 Mobile phone networks have shown even higher growth rates than the Inter- net, according to many reports from ana ...

though WAP was quite different in reach, technology, and performance from the World Wide Web. The WAP Forum has consolidated int ...

■■ Mobility at the application layer (L5) provided by SIP—As we will show, application-layer mobility can support the changing o ...

Table 15.1 (continued) ROAMING USERS LOGGING AWAY FROM OFFICE: HOME AND WHILE TRAVELING The price to pay is the more difficult d ...

Figure 15.1 Basic scenario for roaming users: (a) DHCP network acquisition and (b) SIP registration The terminal mobility scenar ...

Figure 15.2 Terminal mobility: Precall scenario Terminal mobility has to work also when the mobile host is moving between networ ...

Figure 15.3 Terminal mobility: Mid-call scenario using SIP re-INVITE When moving from one foreign network to another, the mobile ...

Figure 15.4 Personal mobility example The example for personal mobility shown in Figure 15.4 also illustrates that users can hav ...

Figure 15.5 Session mobility with seamless handover To avoid the gap for media, the media buffer must be filled before the com- ...

Figure 15.6 SIP network-based call control for fixed-mobile convergence Though much as been written about fixed-mobile convergen ...

SIP Device-Based Fixed-Mobile Convergence An increasing number of SIP endpoints have more than one network interface. This was i ...

Figure 15.7 Mobile IP operation HOME AGENT FOREIGN AGENT MOBILE NODE CORRESPONDING HOST 1 – Datagram to mobile node is forwarded ...

Combining SIP mobility with MIP can, however, give excellent results in some application scenarios by reducing both the delay an ...

Figure 15.8 SIP user agent for GSM- and Wi-Fi-enabled PDA (courtesy Cicero Networks). (a) HP PDA, (b) Qtek mobile phone Network ...

IEEE 802.21 Media-Independent Handover (MIH) We will use in the this section the term “media” to refer to the Layer 2 of the IP ...

The elements in the IEEE 802.21 architecture are: ■■ The various L2 media types: 802.3 (Ethernet), 802.11 (Wi-Fi), 802.16 (WiMAX ...