Hi all, I find a solution to replace in my From the string "anonymous" by "92". So, I do the following : subst('/^(From|f): (.*) <sip:(.*)@(.*)>;/\1: \"Anonymous\" <sip:92@ \4>;/g'); The result is : From: "Anonymous" <sip:anonymous@From: "Anonymous" <sip:92@0172292965@domain.tld>;tag=21910a7967574581o0. I try a lot of pattern, but it doesn't run. Thanks for your support. Regards, Adrien