[Users] x-lite and nat_uac_test(16)

Hi! I've noticed that (at least on my boxes) x-lite uses a different source-port for the sip-connection than the one that is announced in the Via-header. (See the example below.) This behavior results in nat_uac_test(16) always reporting that the client is behind a NAT. Can anyone confirm this behavior? Is it a bug in X-Lite or is there any good reason for it? Cheers, --leo -------------------- 8< -------------------- No. Time Source Destination Protocol Info 4 0.000808 137.208.90.164 137.208.89.45 SIP Request: REGISTER sip:wu-wien.ac.at Frame 4 (640 bytes on wire, 640 bytes captured) Ethernet II, Src: DellEsgP_85:83:ea (00:0b:db:85:83:ea), Dst: Cisco_f3:2e:80 (00:0d:29:f3:2e:80) Internet Protocol, Src: 137.208.90.164 (137.208.90.164), Dst: 137.208.89.45 (137.208.89.45) Transmission Control Protocol, Src Port: 1831 (1831), Dst Port: 5060 (5060), Seq: 1, Ack: 1, Len: 586 Source port: 1831 (1831) Destination port: 5060 (5060) Sequence number: 1 (relative sequence number) [Next sequence number: 587 (relative sequence number)] Acknowledgement number: 1 (relative ack number) Header length: 20 bytes Flags: 0x18 (PSH, ACK) Window size: 1028096 (scaled) Checksum: 0x491e [correct] Session Initiation Protocol Request-Line: REGISTER sip:wu-wien.ac.at SIP/2.0 Message Header Via: SIP/2.0/TCP 137.208.90.164:1676;branch=z9hG4bK-d87543-bd24cf102007467f-1--d87543-;rport Max-Forwards: 70 Contact: <sip:30001@137.208.90.164:1676;rinstance=7ce462f932219953;transport=TCP> To: "Alexander Bergolth"<sip:30001@wu-wien.ac.at> From: "Alexander Bergolth"<sip:30001@wu-wien.ac.at>;tag=b904b134 Call-ID: N2VjNGQxYzZlOWNiYWU5OTMwNzQ4OTZkMWU3NmRkYTE. CSeq: 1 REGISTER Expires: 3600 Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO User-Agent: X-Lite release 1006e stamp 34025 Content-Length: 0 -------------------- 8< -------------------- -- e-mail ::: Alexander.Bergolth (at) wu-wien.ac.at fax ::: +43-1-31336-906050 location ::: Computer Center | Vienna University of Economics | Austria