As h.245 is encoded in PER ,there's no tagging.
If there's ellipsis present and ext.bit os 0,then
Choice index is encoded as a constrained
whole number,starting from 0.
if there are 4 elements before ellipsis,
then the choice index for them is 0-3.
If there's ellipsis present and ext.bit is 1,then
Choice index is encoded as a normally small non-negative
whole number,starting from 0.
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