[Serusers] sending bye using sipsak [onsip.org]

Hi guys, I read the tutorial on http://onsip.org ( http://www.onsip.org/modules/xoopsfaq/index.php?cat_id=3#2 ) about sending byes but has no success with my tries: bye.txt: BYE sip:35923456@1.2.3.4 SIP/2.0 From: sip:222485@5.6.7.8;user=phone To: sip:35923456@1.2.3.4:5060;user=phone Contact: sip:222485@5.6.7.8;user=phone CSeq: 100 BYE Call-ID: 63450d656cbd4f55bec37cbfeb50a181(a)192.168.2.111 Max-Forwards: 16 Content-Length: 0 Call-ID is taken after call is has started. 1.2.3.4 is the ip of my pstn provider and 5.6.7.8 of my ser box. When I try to send it using sipsak: sipsak -f bye.txt -s 62.244.175.133 I got the following error: error: SIPURI doesn't not begin with sip Any suggestions / ideas what I'm doing wrong. Thanks, Pavel