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Re:Telegram Voice Chats by dotancohen on Wednesday December 23, 2020 @02:49PM (#25521396)
Go to `Settings -> Privacy and Security`. For each option (calls / groups / etc) change "Everybody" to "Contacts".
Re:Telegram Voice Chats by mediaman on Wednesday December 23, 2020 @02:59PM (#25521514)
Look again: none of the available options are for restricting incoming messages to contacts (at least on iOS).