Change Contact Field In Sip Invite

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Hi Guys

Does anyone know of a way I can change the contact field in the sip invite to display sip:username:ip instead of sip:did:ip

We need to do this without changing the from field.

I tried using fromuser=username but that just modifies both the contact and the from parameter

I know in freeswitch they use the parameter extension-In-Contact

Has anyone managed to do this before?