Call is a natural sign. Make the letter Y sign with your dominant hand, and hold your pinkie finger against your chin. (This is also the sign for phone.) Then move your 'Y' hand forward, as if to indicate that you are calling somebody.
Teach your baby or toddler the call sign when you are about to make a phone call, so they know that they should be quiet at that time and that you will attend to their needs as soon as your call is done.
Teach your child this sign along with other signs related to your work or how you would like them to behave when you need to make calls at home.
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