The object specifies the jitter buffer mode applied to
a VBD (Voice Band Data) call connection.
adaptive - means to use cMediaGwCcCfgVbdJitterNomDelay as
the initial jitter buffers size and let the DSP
pick the optimal value of the jitter buffer
size between the range of
cMediaGwCcCfgVbcJitterMaxDelay and
cMediaGwCcCfgVbcJitterMinDelay.
fixed - means to use a constant jitter buffer size
which is specified by cMediaGwCcCfgVbdJitterNomDelay.