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Vigor2900 Series User’s Guide
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The codec used for each call can be negotiated with the peer party before each session.
Mic/Speaker Gain Adjust the volume of microphone and speaker by entering
number from 1- 10. The larger of the number, the louder the
volume is.
Default Codec There are five different CODECs you can choose as your prefer
CODEC that you wish to use. However, the real CODEC be
used was negotiate with peer party before session was
established. The default CODEC is G.729A/B; it occupied less
bandwidth while still have good voice quality. It is better for
you to have at least 256Kbps upstream if you would like to use
G.711.
NOTE: If your upstream speed only supports
64Kbps, do not use G.711 CODEC.
Packet Size The amount of data contains in a single packets (10, 20, 30, 40,
50 and 60). The default value is 20 ms, it means the data packet