Hi I am using this block in my t_reply route, and it seems that it from here that the rpid isnt being added, whereas on the first INVITE I seem to be adding it. However I cannot do what Ihave written below... if (!search("^Content-Length:\ 0")) { append_rpid_hf("<sip:", ">;party=calling;id-type=subscriber;screen=yes"); use_media_proxy(); }; Iqbal