Zone Transfer Request

Hi, I've one query regarding zone transfer request. How do a GTM or BIGIP DNS answer zone transfer request, have done this through DNS Express feature of F5, and its' working but its' working as required. I have two DNS one is F5 BIGIPDNS and other one Bind. The IXFR is not working from BIGIPDNS to Bind, where BIGIP DNS is primary and Bind is secondary DNS. Please let me know if anybody know the solution.

Thanks