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Microsoft® Lync® Server 2013 Unleashed Second Edition by Randy Wintle, Alex Lewis, David Ross, Tom Pacyk

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Signaling

In the world of telephony, some information must be exchanged between the PBX and the end users, such as the phone number of the caller and the phone number of the callee, in order to place a call. This is referred to as the signaling information, and it usually contains much more than just phone numbers; for the sake of this section, however, it can be considered what controls the calls. The signaling information is how a call is placed, transferred, or ended. The actual voice traffic, or the audio a user speaks and hears, is considered the media. So in any call there is signaling information to control the call, and a media stream that is the actual audio heard. Keep in mind that the path taken by these two items does not have to ...

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