[Serusers] sipsak problem

hello, i'm testing sipsak. ./sipsak -M -B "test " -s sip:dummy@X.X.X.2:5060 this command work well. Then i want to use the -f file option: ./sipsak -f test.txt -s sip:dummy@X.X.X.2:5060 with the file test.txt: MESSAGE sip:dummy@X.X.X.2:5060 SIP/2.0 From: <sip:sipsak@X.X.X.1> To: <sip:dummy@X.X.X.2:5060> Call-ID: &lt;1234567(a)X.X.X.1&gt; CSeq: 2 MESSAGE Content-Type: text/plain Content-Length: 5 User-Agent: sipsak 0.8.12 Line-based text data: text/plain test The command wait for 20s and finish with: ** give up retransmissioning.... and i don't capture any SIP messages with ethereal. A idea? thanks