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

The results in Figure 15.10 show a very smooth handover performance from combining SIP with IEEE 802.21 media-independent handov ...

Figure 15.11 Network selection scenario: two credentials and three links Besides the complexity caused by L2 and L5 signaling, a ...

[4] “IMS: A Critique of the Grand Plan” by J. Waclawski. Business Communica- tions Review, October 2005, pp. 54–58. A summary of ...

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273 Users and government regulators expect VoIP service providers to support emergency calls as good or better than the PSTN. Em ...

on). Determining the right PSAP is not trivial either, because the service boundaries for the various response centers for polic ...

■■ Credible emergency call testing mechanisms mustbe provided. ■■ It should be possible to invoke relay services for the hearing ...

Table 16.1 Types of Location Information TYPE EXAMPLE Civic Country, state, city, street address and floor, appartment, or cube. ...

Table 16.2 (continued) DELEGATION TREE BRANCH ADDRESS Street main.pittsburg.allegheny.pa.us.sos.arpa Street Number 123.main.pitt ...

emergency numbers, various mechanisms exist. GSM mobile phones use the SIM card inside the device, while 3G mobile phones rely o ...

Figure 16.1 Emergency call routing on the Internet Once the location and the PSAP URI are available, three call routes are possi ...

Possible motivations for attackers could be the following: ■■ Prevent the caller from receiving aid ■■ Gain infomation about the ...

Figure 16.2 Emergency VoIP calling using the PSTN emergency infrastructure Emergency Communication Services Emergency calls, as ...

The IETF working group on Internet Emergency Preparedness (ieprep) [12] is working on various Internet standards for emergency p ...

Figure 16.3 TDM-IP preemption event The scenario in Figure 16.4 starts with UA1 initiating a call to UA2 using an INVITEmessage ...

As a consequence, UA2 will send a BYEmessage to UA1 that contains the reason header: Reason: Preemption; cause 1, text=”UA Preem ...

Summary Internet communications based on SIP can provide rich and reliable emer- gency call services for end users, such as “911 ...

[10] “Communications Resource Priority for SIP” by H. Schulzrinne and J. Polk. Internet Draft, IETF, July 2005. [11] “Extending ...

287 About Accessibility Providing real-time communications to hearing- and/or speech-disabled peo- ple is both a moral and econo ...

Accessibility on Legacy Networks and on the Internet The legacy telephone network, though it was designed and optimized for 3.1 ...