Hey All, I always have issues with substituting out header values. I’ve tried subst and subst_hf. Here is the value that I want to change out: Contact: <sip:52.41.52.34:5060;line=sr-h06Cy7RYRFkYacM0a7epa7sVa7sVRcNCW7IbaGZ9RGlC> And this is what I want it to be Contact: <sip:1313717555@jump.dsiprouter.net <sip:1313717555@jump.dsiprouter.net>;line=sr-h06Cy7RYRFkYacM0a7epa7sVa7sVRcNCW7IbaGZ9RGlC> I’m using this subst('/^Contact: <sip:(.*);(.*)>$/Contact: <sip:1313717555@jump.dsiprouter.net;\2>\r/ig’); And it doesn’t work, but putting into a online regular expression tester it looks good as shown below. Any ideas?