Add tgrp tag to INVITE

We use an SBC for routing, with many outbound Trunks.
Our vendor offers the choice of skiping routing and select the outbound trunk based on the tgrp tag added to the SIP INVITE.
It should look smiliar to this:
INVITE sip:18585558879;npdi;tgrp=40555@;user=phone;transport=udp SIP/2.0

Where 40555 would be the desired outbound trunk on the SBC, and is the SBC .

How do I setup my Freepbx trunk so that the tgrp tag can be inserted?

We use Freepbx 15 and 16.

Any help is greatly appreciated.

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