Hi, How can I add a header to SDP? Actually what I want to do is, whenever an INVITE with SDP comes, search for a ptime and if ptime can not be found, add a default line to SDP body. Like if (has_body()){ if (!search_body("ptime") { # like below à # append_body("a=ptime:20"); } } Thanks, Kuddusi CIFTCIBASI Next Generation Networks Teletek Telecommunication Services Corp. Ayazma Dere Cad. Aksit Plaza No:12/1 Fulya, Besiktas , 34349, www.teletek.net Tel : +90 212 227 7030 Direkt: +90 212 310 2233 Fax : +90 212 227 8700 Email: kuddusi.ciftcibasi(a)teletek.net Skype : realkudu MSN : kuddusic(a)hotmail.com Yahoo: kuddusi.