Cortelco 2747 - Manual (Page 37)

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4.4.2.2 Handset Volume
Adjusts the volume of incoming calls on the handset.
4.4.2.3 Handfree Volume
Adjusts the volume of incoming calls on the handsfree.
4.4.2.4 CodecTxGain
Adjust the output voice volume.
4.4.2.5 Ring Type
Changes the ringing type(ring pattern) of an incoming call.
4.4.2.6 RTPLowBW
Checking this box will cause the phone to decrease the voice packet
bandwidth in the transmit direction. This should only be used if the
internet bandwidth is not good enough to support normal packet
bandwidth.
4.4.2.7 Jitter Buffering
Checking this box will increase the jitter buffer from 150ms to 400ms.
This may improve the received voice quality in some internet
connections.
4.4.3 Others
4.4.3.1 VAD
Checking this box will enable Voice Activity Detection. With this feature
enabled, the phone will detect if the user is talking and will not send
packets when the user is silent. This can help to decrease the bandwidth
requirement.