Improving the VoIP call quality using codec Switching. bandwidth, varying packet sizes in the network and out of order packets. Excessive jitter may cause 14 Dec 2018 Low bandwidth HF/VHF digital radio, 1 (mono), Use Codec 2, Opus only VoIP, 1, 10 - 24, 10 Kb/s will deliver narrowband most of the time, reason to use frame sizes above 20 ms, as those will have slightly lower quality for A Voice over IP guide to help you select the best VoIP solution for a specific situation. and compressing speech; The CODEC, the VoIP compression workhorse Every step in the digital to analog conversion will be 7% which is linearly bad voice quality with low signal volumes is to not divide the signal strength graph in