This object indicates the number of subnetworks that can
be permitted behind the Mobile station. This object can be
set only when the object cgprsAccPtNetworkBehindMsEnable is
set to 'true' as this object can take effect only when
cgprsAccPtNetworkBehindMsEnable is 'true'. Setting the value
of '0' to this object will not take effect. The value of this
object will be set to '0' only if the object
cgprsAccPtNetworkBehindMsEnable is set to 'false'.