Can one of you please let me know how i can copy the P-Asserted-Identity header from the incoming INVITE to the outgoing INVITE?

I did go through most of the articles but none of them helped. 

I have tried the below so far in my dialplan

 <action application="set" data="sip_h_P-Asserted-Identity=${sip_P-Asserted_Identity}"/>  <action application="bridge" data="{sip_cid_type=pid,origination_privacy=screen}sofia/internal/${destination_number}@${distributor(cust-site_p)}"/>

Thank you in advance

Regards,