Yukarıda da dediğim gibi her ikisi de olur. Ayrıca merak ettim baktım; Oxford 'on duty' ve 'on call' u eşanlamlı göstermiş zaten.
on call
ON DUTY, on standby, available.
-Concise Oxford Thesarus-
at call or on call
1.
a : available for use : at the service of <thousands of men at his call>
b : ready to respond to a summons or command <a doctor on call>
2. : subject to demand for payment or return without previous notice <money lent at call>
- Merriam Websters Collegiate-
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