Hi,
Oh, I see. Than you have to make sure that the parameter you insert is a URI parameter and not a header parameter, so it must be within <>. And you have to get only the URI of the original contact header field, not the whole HF value (if you do not use a static value), because the URI may have been already enclosed in <>:
assign_hf_value("Contact", "<%@contact.uri;param=value>");
But you loose the header parameters this way :(
That should be enough for my purpose. Thank you.
Lada