From header manipulation

Hi all,

could you please help me with correct settings of Asterisk. I have set up one extension (184 is assigned for this extension) For this extension is “Outbound CID” is set to “Ferko Mrkvicka” <+XXXXXXXXXXX4>. VOIP operator requires in INVITE message in FROM header “user=phone”. Unfortunately I was not able to do it. My From header looks like:
From: “Ferko Mrkvicka” <sip:[email protected]>;tag=as4ebd28bc

but it should be:
From: “Ferko Mrkvicka” <sip:[email protected];user=phone>;tag=as4ebd28bc

Could you please advice what parameters should I change to have “user=phone” in from header?

thanks in advance.
Best Regards,