[Serusers] Simulate BYE Message

Hello, I'm trying to send out a SIP BYE Message with sipsak to make my phones hanging up (to force them to hang up)... I used a file that is called bye.ser and looks like this: BYE sip:55@192.168.1.101:5060 SIP/2.0 Route: <sip:192.168.1.222:5061;lr> From: sip:14@192.168.1.101:5062;user=phone To: sip:55@192.168.1.101:5060;user=phone Contact: sip:14@192.168.1.101:5062;user=phone CSeq: 42759 BYE Call-ID: 746707906-47a484e6(a)192.168.1.101 User-Agent: sipsak 0.8.13 Max-Forwards: 16 Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE Content-Length: 0 ...using the command: sipsak -f bye.ser -s sip:192.168.1.222:5061 -vvv ... but the message doesn't go out. My ser is running on 192.168.1.222:5061 Well, my question is: How can I capture the SIP messages that are going through my ser?? Is there any debug option to do that? It would be easier for me to simulate it after... Many thanks!! Sebastian