The object indicates the maximum number of frame-blocks
allowed in an interleaving group. It indicates that
frame-block level interleaving will be used for that
session. If this object is not set, interleaving
is not used. This object is applicable only when
RTP frame type is octet aligned. This object is not
instantiated when the object cvVoIPCallHistoryCoderTypeRate
is not equal to gsmAmrNb enum.