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

Internet Standards—Specifications that have significant implementations and for which a successful operational experience has b ...

Wide Web is that the various parts should be designed and implemented inde- pendently of each other, and yet still interoperate ...

The authors take a dim view of all these and believe that the market will prove the original Internet design to be the most effe ...

Summary The emergence of the Internet as both The Networkand The Servicehas occurred because of its technical excellence with de ...

53 This chapter introduces the Domain Name System (DNS), and ENUM, a tele- phone number mapping system for Internet resources. R ...

Since the built-in DNS client will talk to one of the configured DNS servers in the local IP protocol stack (DHCP or static conf ...

registered with the Internet Assigned Number Authority (IANA) [5] or host names registered for a specific domain. URIs are indep ...

Tel URI No Internet device needs to have knowledge of telephone numbers and their context-specific meanings, but needs only to u ...

If a phone-contexttag is not present in the URI, then some other context (typically geographic) must be used to interpret the di ...

locate an appropriate gateway. In this case, the URL for the location of the SIP proxy would look like: sip:+1-214-555-1212@prox ...

Delegation The actual DNS records for host names and servers, and so on, for a domain are the responsibility of, and under the c ...

The DNS is designed to support many applications, such as referring to host addresses or mailbox data, and, as shown here, is al ...

Table 4.2 DNS and ENUM Terminology Domain Name The Domain Name is a list of labels on the path from the node to the root of the ...

Table 4.2 (continued) The failure of one or more servers should not cause a service failureat all, as long as there are other se ...

Figure 4.2 High-level DNS and ENUM service example for SIP Finding an Outgoing SIP Server We assume the user Alice has a SIP ser ...

Following is the legend for the items in the NAPTR response: ■■ IN—Internet class ■■ NAPTR—Query type ■■ 50 —Ordering for target ...

control and have the DNS client in the SIP endpoint, although for backward- compatibility with many legacy SIP UA implementation ...

Figure 4.3 DNS and NAPTR service examples The regular expression in the NAPTR response is a powerful technology to control the s ...

Blocks of phone numbers may be allocated to specific SIP service providers or to IP PBXs accessible from the Internet. This may ...

The predominant availability of phones with 12-digit keypads (10 numeri- cal digits, plus the special characters “#” and “*”) ma ...