'Call out' is a phrasal verb that is used in both professional and social contexts. Usually, 'calling out' to someone means to make a visit to their home. This is where we get the noun 'a call-out'. If you are 'calling out' to someone, you could be asking for help in some way. In more modern colloquial language, to 'call someone out' means to criticize them publicly for their wrongdoings.
Additional examples with 'call out':
A person is interviewed about their heroic act, helping a man who was trapped in a car:
"I heard a voice call out for help in the dark. I didn't know if it was a trick but I had to see for myself."
A friend who hasn't seen you for a while is on the phone:
"I was thinking of calling out to you during the week."