7110.65 5-3-2 and
7110.65 4-3-4.
When one of our towers call for release, my simple response is: "N12345, Released, AB."
PHRASEOLOGY-
To another controller,
(aircraft identification) RELEASED.
If unable to release: "N12345, hold for release, expect 5 minute departure delay, AB."
PHRASEOLOGY-
(aircraft identification) HOLD FOR RELEASE, EXPECT (time in hours and/or minutes) DEPARTURE DELAY.