AudioCodes Mediant 600 Manual de usuario Pagina 475

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Version 5.4 475 May 2008
SIP User's Manual 10. Media Server Capabilities
Figure 10-4: Applying Media Services on a Conference -- SIP Call Flow
10.1.2.5 Active Speaker Notification
After an advanced conference is established, the Application Server can subscribe to the
device to receive notifications of the current set of active speakers in a conference at any
given moment. This feature is referred to as Active Speaker Notification (ASN) and is
designed according to the MSCML standard. Notifications provide information on the
number of active participants and their details.
The notifications are sent unsolicited at specific intervals requested by the application and
only when a change in the number of active conference speakers occurs. If a change in the
speakers list occurs, the server issues an INVITE to the specific SIP UA, and then transfers
the call to the UA.
Event notifications are sent in SIP INFO messages, as shown in the example below of XML
Response Generated for ASN:
<?xml version="1.0" encoding="utf-8"?>
<MediaServerControl version="1.0">
<notification>
<conference uniqueID="3331" numtalkers="1">
<activetalkers>
<talker callID="[email protected]"/>
</activetalkers>
</conference>
</notification>
</MediaServerControl>
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