Don't mean to jack the thread but I'm having the same issue. Here is my log:
20:05:51.132 [CM502001]: Source info: From: "1001"<sip:1001@ymaster>;tag=b4659848<sip:1003@ymaster>
20:05:51.132 [CM503013]: Call(24): Incoming call rejected, caller is unknown; msg=SipReq: INVITE 1003@ymaster tid=54b08614dc364aeb cseq=INVITE
contact=1001@192.168.200.10:10590 / 2 from(wire)
20:05:51.012 [CM500002]: Unidentified incoming call. Review INVITE and adjust source identification:
INVITE sip:1003@ymaster;transport=udp SIP/2.0
Via: SIP/2.0/UDP 192.168.200.10:10590;branch=z9hG4bK-d8754z-5d43fa118fa86eba-1---d8754z-;rport=10590
Max-Forwards: 70
Contact: <sip:1001@192.168.200.10:10590;transport=udp>
To: <sip:1003@ymaster>
From: "1001"<sip:1001@ymaster>;tag=b4659848
Call-ID: NGJiOWYwZjg5MTcyZmJlNDdmZDA1NThhYzg5NjgwOWQ.
CSeq: 1 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
Supported: replaces
User-Agent: X-Lite 4 release 4.1 stamp 63214
Content-Length: 0
20:05:51.012 [CM302001]: Authorization system can not identify source of: SipReq: INVITE 1003@ymaster tid=5d43fa118fa86eba cseq=INVITE
contact=1001@192.168.200.10:10590 / 1 from(wire)
19:59:20.300 [CM503013]: Call(23): Incoming call rejected, caller is unknown; msg=SipReq: INVITE 1003@ymaster tid=a7049e28554dfe20 cseq=INVITE
contact=1001@192.168.200.10:10590 / 2 from(wire)
INVITE sip:1003@ymaster;transport=udp SIP/2.0
Max-Forwards: 70
To: <sip:1003@ymaster>
Call-ID: NzYwZTYwYjkxM2MyZDY2ZjRmY2RlY2EwMWMwZGJjYzY.
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
User-Agent: X-Lite 4 release 4.1 stamp 63214
19:58:14.653 [CM502001]: Source info: From: "1003"<sip:1003@ymaster>;tag=f2e79dca<sip:1001@ymaster>
19:58:14.520 [CM500002]: Unidentified incoming call. Review INVITE and adjust source identification:
Via: SIP/2.0/UDP 192.168.200.12:14168;branch=z9hG4bK-d8754z-87f4fdbe9b911f28-1---d8754z-;rport=14168
Contact: <sip:1003@192.168.200.12:14168;transport=udp>
From: "1003"<sip:1003@ymaster>;tag=f2e79dca
CSeq: 1 INVITE
Supported: replaces
Content-Length: 0
19:58:14.519 [CM302001]: Authorization system can not identify source of: SipReq: INVITE 1001@ymaster tid=87f4fdbe9b911f28 cseq=INVITE
contact=1003@192.168.200.12:14168 / 1 from(wire)