According to the context, the underlined word means "calling", which is the action of exchanging information between two people through the use of a device such as the telephone.
It refers to the action of communicating with someone, which implies some type of exchange of information.
In the example, another person is thanked for having called, which implies the transmission and exchange of messages between a sender and a receiver.
Therefore, we can conclude that according to the context, the underlined word means "calling".
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