This timeout is applied to the dnis if its dnisGlobalStatus
is set to disabled(2). After the timeout expires, this
dnis changes its dnisGlobalStatus to enabled(1).
This timeout may be set at any time, even if the previous
one has not yet expired.
If this timeout is not set by user at the time
dnisGlobalStatus set to disabled(2), it is set
to its default value.
Note: When being read, this attribute shows the time interval
remaining till expiration.