Is it possible and how to prohibit a transfer in an asterisk to certain numbers?

Question

Asterisk

Dear users! I have a question related to call transfer. For example, if in an asterisk they call from ext. numbers to an internal one, is it possible after that to prohibit the transfer of a call to a certain number or a number that, for example, starts with 7. We are talking about the prohibition of transfers, and not calls directly.
I use astersic+freepbx13

Answer 1

Expose TRANSFER_CONTEXT to such calls. Transfer calls will be redirected to the specified context, and here you already draw the rules you need.