Contrary to popular belief, there is no provision or entitlement to four hours payment  (suitably enhanced) for receiving a telephone call at home.

If, however, a call is received and as a result of that call you are required or instructed to go somewhere, or perform duty, then the view is that this may well be a recall to duty and be eligible for the appropriate amount of compensation.

Answering the telephone does not constitute a recall to duty.