Chapter 19. Media Servers and Conferencing

In previous chapters (5 and 17), we saw how SIP application servers can be used to build SIP services. The service functionality was achieved through an intelligent manipulation of the SIP dialogs. Such manipulation managed to change the conversation space. A call transfer application is an example of such a service.

Nevertheless, not all the services delivered through SIP imply just manipulation of SIP dialogs. In fact, there are a lot of applications that also imply some processing at the media level. Take, for instance, a voice-mail service that requires the voice mail to play an announcement and record a message. Or think about services that require user input in the form of DTMF.[1] Also, conferencing ...

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