Hold and transfer on zap pri line

I have an inbound callcenter asterisk. i.e. All calls come to my Asterisk server on zap channel and after ivrs, transferred to agent on sip channel. Its working fine for me.

Now i have one traditional EPABX from which i got PRI line for Zap card. And all agents are on its FLC card i.e. have analog extension on Traditional epabx.

All calls come to asterisk from local epabx. It has factility of Hold and Transfer on PRI line. and its working fine for me on Dialogic.

I want to transfer my zap channel call to analog extension for which i have to send flash command, some hex digit and extension number to my local pbx. This is like flashtransfer feature on Analog extension. I tried all the transfer functions, feature list but no solution found.