Cisco Cisco Agent Desktop 9.0 Technische Referenzen
Cisco CAD VoIP Monitoring and Recording Guide
40
November 26, 2013
different parties can be on the same call. How does this look to the packet capturing
software?
software?
In a normal two-party call, the phones send their stream directly to the other device
over the network. Whenever a call is made into a conference call by adding parties,
Cisco Unified CM software is responsible for merging the audio data from multiple
parties so the phones that are part of the conference call still only see two streams.
This is done through a media mixer or media blender software component (
over the network. Whenever a call is made into a conference call by adding parties,
Cisco Unified CM software is responsible for merging the audio data from multiple
parties so the phones that are part of the conference call still only see two streams.
This is done through a media mixer or media blender software component (
).
When a conference call is created, the Unified CM tells each phone that is on the call
to send its outgoing audio stream to the media blender component (usually running
on the Unified CM server). In
to send its outgoing audio stream to the media blender component (usually running
on the Unified CM server). In
, the media blender receives three streams
(1, 2, and 3), one from each of the phones. It blends the necessary audio streams into
a single stream and sends it out to the phone on the call. Stream 2 and 3 are merged
and sent to the first phone. Streams 1 and 3 are merged and sent to the second
phone. Finally, streams 1 and 2 are merged and sent to the third phone.
a single stream and sends it out to the phone on the call. Stream 2 and 3 are merged
and sent to the first phone. Streams 1 and 3 are merged and sent to the second
phone. Finally, streams 1 and 2 are merged and sent to the third phone.
Figure 19.
Audio streams for a two-party call
Figure 20.
Blended audio streams on a conference call