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<h2><a href="https://wiki.asterisk.org/wiki/display/AST/SIP+use+cases">SIP use cases</a></h2>
<h4>Page <b>added</b> by <a href="https://wiki.asterisk.org/wiki/display/~mmichelson">Mark Michelson</a>
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<h1><a name="SIPusecases-MediaSessions"></a>Media Sessions</h1>
<h3><a name="SIPusecases-Onewayincomingcall"></a>One-way incoming call</h3>
<ul>
<li>Alice picks up her SIP phone and dials an extension.</li>
<li>Alice hears a prompt telling her that her phone system has been consumed by weasels.</li>
<li>Alice hangs up, confused.</li>
</ul>
<h3><a name="SIPusecases-Onewayoutgoingcall"></a>One-way outgoing call</h3>
<ul>
<li>An administrator presses a button on a website to call Bob.</li>
<li>Bob's phone rings.</li>
<li>Bob answers his phone.</li>
<li>Bob here's a pre-recorded plea from a politician to cast a vote for him in the upcoming election.</li>
<li>Bob hangs up, angry.</li>
</ul>
<h3><a name="SIPusecases-Twowaycall"></a>Two-way call</h3>
<ul>
<li>Alice picks up her SIP phone and dials an extension.</li>
<li>Bob's phone begins ringing; Alice hears ringing in her handset's microphone.</li>
<li>Bob answers his phone.</li>
<li>Audio flows in both direcitons.</li>
<li>Alice hangs up.</li>
</ul>
<h3><a name="SIPusecases-Originatedtwowaycall"></a>Originated two-way call</h3>
<ul>
<li>A script places an outgoing call to Bob.</li>
<li>Bob's phone rings.</li>
<li>Bob answers his phone.</li>
<li>The script now places an outgoing call to a call center agent.</li>
<li>The call center agent answers the call.</li>
<li>Bob and the call center agent can now exchange audio.</li>
<li>Bob hangs up.</li>
</ul>
<h3><a name="SIPusecases-Canceledcall"></a>Canceled call</h3>
<ul>
<li>Alice picks up her SIP phone and dials an extension.</li>
<li>Bob's phone begins ringing; Alice hears ringing in her handset's microphone.</li>
<li>Alice hangs up while Bob's phone is still ringing.</li>
<li>Bob's phone stops ringing.</li>
</ul>
<h3><a name="SIPusecases-Videocall"></a>Video call</h3>
<ul>
<li>Alice tells her laptop's SIP soft phone to place a call.</li>
<li>Bob's laptop's SIP soft phone makes a horrible racket indicating there's an incoming call.</li>
<li>Bob answers his phone.</li>
<li>Audio and Video flows in both directions.</li>
<li>Alice hangs up.</li>
</ul>
<h1><a name="SIPusecases-Registrations"></a>Registrations</h1>
<h3><a name="SIPusecases-Initialregistration"></a>Initial registration</h3>
<ul>
<li>Alice plugs her new SIP phone into the network.</li>
<li>The SIP phone should register its location with the server with a specified expiration.</li>
<li>Bob places a call to Alice.</li>
<li>The server should be able to locate Alice's phone and call her.</li>
</ul>
<h3><a name="SIPusecases-Reregistration"></a>Re-registration</h3>
<ul>
<li>Alice plugs her new SIP phone into the network.</li>
<li>The SIP phone should register its location with the server with a specified expiration.</li>
<li>When the expiration is reached, Alice's phone should refresh the registration.</li>
<li>Bob places a call to Alice.</li>
<li>The server should be able to locate Alice's phone and call her.</li>
</ul>
<h3><a name="SIPusecases-Registrationtimeout"></a>Registration timeout</h3>
<ul>
<li>Alice plugs her new SIP phone into the network.</li>
<li>The SIP phone should register its location with the server with a specified expiration.</li>
<li>Alice removes her SIP phone from the network.</li>
<li>The expiration time from the original registration is reached.</li>
<li>Bob places a call to Alice.</li>
<li>The server is unable to locate Alice's phone to call her.</li>
<li>Bob hears a fast busy tone.</li>
</ul>
<h3><a name="SIPusecases-"></a></h3>
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