Gst on directors sitting fee

As per place of supply of provision the place of supply of service is the place of registered person or actually where services are rendered.
in your case, if you mentioned any registered office in GST registration then workout GST accordibgly.
if it is not then biffurcate sitting fee as per turnover basis and pay GST accordingly, because common services provided by director to your company situated in state A and State B.

its not clear.. our board meeting was held in Delhi and the directors are from Delhi and we are registered in mumbai.. so please clarify if we need to pay igst sgst or cgst?