Placing the fingers in the ears for the mu'adhdhin during the adhan; does this have a basis in the Shari'ah?

Question:
He says: Honorable Shaykh, may Allah grant you success, does raising the hands and placing them in the ear or on the ear for the mu'adhdhin have a basis in the Shari'ah?

Answer:
Yes, the sunnah (recommended practice) is that he places his fingers in his ears, inserting his two index fingers into the openings of his ears. This is what he says, because this raises the voice. This raises the voice. This is a sunnah, yes.