Call-backs are good practice when they are done properly
A call-back to a number independently confirmed from a trusted record remains a sound control. It separates the check from the number or link supplied in the request and gives staff a chance to read the complete instruction back. The operational problem is consistency: finding the source, ending the call, redialling and documenting the outcome creates friction precisely when a client says the matter is urgent. Vericode is the 10-second, always-documented version of that same good practice, not an argument against call-backs.