This attribute specifies the type of calls offered by this DcmeVs. If
the value permanent64kVs is selected the 64 kbit/s call is
established on the channel associated with this DcmeVs upon
system activation. If this call is cleared due to the subnet failure it is
reestablished again by the DcmeLink. If the value dynamicVs is
selected this channel can be used to establish user selected calls.