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

often provided in band in the media path (such as ring tone, busy signal, reorder tone, and so on). These indicators are carried ...

would generate it. The 183 Session Progressis not used. In this scenario, if the SIP user agent returned an error response (such ...

Figure 11.3 PSTN-to-SIP call Table 11.1 ISUP IAM Message and Field Description INITIAL ADDRESS MESSAGE (IAM) DESCRIPTION CgPN=31 ...

The IAM can be mapped to the SIPINVITEMessage 2 of Figure 11.3 as shown here: INVITE sip:[email protected];user=pho ...

Figure 11.4 SIP-T call flow with ISUP tunneling SIP-T also uses the INFOmethod to carry midcall signaling information, as shown ...

Call-ID: [email protected] CSeq: 1 INVITE Contact: <sip:ngw1.carrier.com;user=phone> MIME-Version: 1.0 Content-Typ ...

to be encrypted using S/MIME because of the sensitivity of some information present there (such as the calling party number of a ...

Enhanced Telephony Services One remarkable promise of SIP-enhanced telephony services is that they can be implemented across the ...

“line” behavior would return a 180 Ringingresponse and initiate alerting even when there is an active session established. The c ...

■■ Incoming and outgoing call screening—Incoming and outgoing call screen- ing can be implemented in either a proxy or a user ag ...

Besides emulating PBX features, SIP also can emulate AIN services found in the PSTN. Both capability sets CS-1 and CS-2 defined ...

A list of call scenarios in use at present would include the following: ■■ Managing telephony applications from the desktop PC ■ ...

SIP can be applied for extremely complex call scenarios for all of the call sce- narios presented here. The question is, “Is the ...

Following are examples of the Referred-Byheader: ■■ Referred-By: sip:[email protected];ref=http:// headhunters.comprovides the ref ...

Basic Third-Party Call Control The concept for basic third-party call control is shown in Figure 11.5, where a controller will s ...

controller to the controlled parties and to make the controlled SIP endpoints exchange RTP media with each other. If the control ...

Peer-to-Peer Third-Party Call Control SIP can be used for complex call control applications in the peer-to-peer con- trol model. ...

SIP servers that normally route all calls are not shown in Figure 11.6 so as to focus the example on only peer-to-peer third-par ...

References [1] “Session Initiation Protocol for Telephones (SIP-T): Context and Architec- tures” by A. Vemuri and J. Peterson. I ...

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