Whenever Captain Kirk and his shipmates leave the ship and go to some surface and whenever Captain Kirk calls back his ship with his communicator, the communicator emits a particular sound, like a whistle which is then followed by the dialogue "kirk to enterprise, come in"
Mind you its a whistle sound of the communicator i am looking for and not the "dit dit dit dit" sound that turns up when i do a google search...its a whistle sound
admin edit:
More ringtones here:
cant find original star trek communicator ringtone