You could do a really ugly hack...
remove_hf("Contact");
and then insert the Contact with something like...
insert_hf("Contact: sip:$var(user)@PROXYIP;hack=ugly\r\n");
And then on the client leg...
if ($(ru{uri.param,hack}) == "ugly")
replace it with the original....
But this is very, very ugly and Alex's approach is better. =)
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