Hi! On initial INVITE requests, topoh will add the following cookies to the messages (th_msg_received): Via: ...;TH=div TH: dih When the message is forwarded, the cookie will be parsed again in th_msg_sent():th_get_cookie(). th_get_cookie tries to parse the cookie from the header, and if this fails, from the Via header: th_get_via_cookie(msg, msg->via1); But I guess msg->via1 points to the newly added Via header. So, shouldn't this be th_get_via_cookie(msg, msg->via2); instead? But of course when processing replies then I guess it must be via1. So, maybe there should be different code for requests and responses. I found this because I accidentially deleted the TH header with keep_hf(); regards Klaus