Lync 2013 media and signaling

Dear All,

I always hear media and signaling in Lync 2013 environment, Media it's about voice and video, but is signaling? i can't understand it :(

please help
RhalaAsked:
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Cliff GaliherCommented:
Signaling in VoIP, including Lync, refers to the way client and server coordinate when a calll starts, ends, is put on hold, transferred, etc.
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RhalaAuthor Commented:
thanks Cliff, can you provide more details please.
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Cliff GaliherCommented:
What, specifically, do you want more details about?
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RhalaAuthor Commented:
what types of signaling we have in Lync?

how the signaling works and where?
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Cliff GaliherCommented:
Signalling is the term used to describe how one endpoint tells the server or another endpoint what it is doing or wants to do. For example, if I am in an IM conversation with another user and want to send them a file, my Lync client "signals" the other link client that it wants to send a file. Then the other lync client will "signal" if the user has accepted or declined the request.

The actual file is data. Just like a voice call, the actual audio stream is data. But whether a person has hung up, has hit the "ignore" button, or taken another similar action...that is *all* signaling.  It is another word for "behind the scenes" communication.

As such, almost any action in Lync involves some sort of signaling traffic. And Lync uses the SIP protocol for signaling. It happens *everywhere.*  And there are hundreds of different signals. SIP is a very robust protocol. Think of it somewhat like HTML (it is not exactly an accurate comparison, but HTTP is not complex enough)....asking what kind of signaling is like asking what kinds of HTML tags are available.  Pick up any book on HTML and you can see there are hundreds of tags. With more becoming "standard" every day. And that doesn't even touch CSS.

There is no way I can break down SIP in a single EE post.
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Jeff_SchertzCommented:
Take a look at this in-depth blog post which covers your question:
http://blog.schertz.name/2014/08/understanding-lync-modalities
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