Hidden Pages for QX Advanced Configuration
3.3 Codecsconfig
The Voice Codecs Settings page enables/disables the CNG and Extrapolation options for voice
codecs and configuring the below listed settings.
Figure 3: Voice Codecs Settings page
• Select G729 Codec Type: allows choosing between the G729 codec types.
• Terminate stream if no packets received in: Time (in seconds) after which the connection
with the remote endpoint will be closed if no packet is received.
• CNG (Comfort Noise Generation): A technique used in codecs to generate an artificial noise if
no voice packet or a CN packet is received from the remote party. With typical PSTN
networks people are accustomed to hearing a very low level of background noise on a call.
Without Comfort Noise packets being locally generated by the QX or far-end there would be
complete silence on the call when a person is not speaking and the other party would think
the call was disconnected.
• Extrapolation: A technique used in codecs to recover a lost or delayed RTP packet to
provide a seamless voice experience to the user.
• To disable the CNG or Extrapolation option for a codec, select the codec and click on Edit
(see
Figure 4). Clear the checkbox for the appropriate option and click on Save.
Revision 1.0 7 20-Feb-15
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