Fixed Income - CMBS Call Protection only, like, protection, anywhere, material

luckygiftvn

The Schweser material says that call protection is needed as with any fixed income security when considering CMBS'...

why is call protection not discussed anywhere else and only under this section?

Also, is call proteciton kind of like prepayment risk only that the prepayment is made by the issuer of the securitized security (e.g., CMBS) as opposed to the borrower?