Call protection
From ACT Wiki
Protection for lenders/investors in securities, against the potentially adverse effects of call risk.
The issuer's right to call for early redemption is restricted.
For example, they may be prevented from making a call until a specified time period has elapsed.
Another type of protection is a Spens clause.
Non-bank investors buying bank loans in the secondary market have been the source of pressure for some call risk protection in loans.