Thanks Daniel, I managed to extract the port value. First I had to remove all cr and nl characters from the original content of $rb by using the re.subst transformation as many times as lines there are in the sdp, I don't know if this can be done in a smarter way with the existing transformations, anyway, it works. Regards, Antón -- View this message in context: http://www.nabble.com/get-sdp-audio-port-in-a-script-variable-tp23061909p23… Sent from the OpenSER Users Mailing List mailing list archive at Nabble.com.