A guardian’s authorization of a proxy to marry off his daughter over the telephone

Question:
He says: Honorable Shaykh, may Allah grant you success, is it permissible for a guardian to authorize someone to marry off his daughter over the telephone, saying for example, “I have authorized you to marry off my daughter”?

Answer:
This is not accepted now. The contract must be in the courts or with a legal marriage officer, and it is not accepted except with a document. The authorization is not accepted except with a document from the contract writer. Matters have been regulated; they are not as they were in the beginning. Yes.