Describes the status of the active SVC. Valid values are:
other - none of the types specified below
establishmentInProgress - connection is not operational,
but call attempts are ongoing
connected - connection is currently operational
retriesExhausted - retry limit has been reached and call
attempts have ceased
noAddressSupplied - no remote address has been configured,
so no call attempts are initiated
lowerLayerDown - underlying CES IWF is not operational
When the entry is not 'active', the value of this object is
'other'.