Mine

U +0.003499 UAC:5060 -> OpenSER:5060
INVITE sip:*721111111111@sip.demo.com:5060 SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.126;rport;branch=z9hG4bKc0a8007e000000ab464b0e0c00006c7e000005ed.
Content-Length: 339.
Contact: <sip:9492666205@192.168.0.126:5060>.
Call-ID: 0ED32AD0-3691-44D8-9E19-A32F5C913F43@192.168.0.126.
Content-Type: application/sdp.
CSeq: 2 INVITE.
From: "unknown"<sip:9492666205@sip.demo.com:5060>;tag=21354640612611.
Max-Forwards: 70.
To: <sip:*721111111111@sip.demo.com:5060>.
User-Agent: SJphone/1.60.289a (SJ Labs).
Proxy-Authorization: Digest username="9492666205",realm="sip.demo.com",nonce="464b0ff63e0f4811d6088743e444b9366ab3235f",uri="sip:*721111111111@sip.demo.com:5060",response="9a3e196b8918ae26544058e314c9dc28",cnonce="2135464536267",qop="auth",nc="00000001".
.
v=0.
o=- 3388312716 3388312716 IN IP4 192.168.0.126.
s=SJphone.
c=IN IP4 192.168.0.126.
t=0 0.
a=direction:active.
m=audio 49244 RTP/AVP 3 97 98 8 0 101.
a=rtpmap:3 GSM/8000.
a=rtpmap:97 iLBC/8000.
a=rtpmap:98 iLBC/8000.
a=fmtp:98 mode=20.
a=rtpmap:8 PCMA/8000.
a=rtpmap:0 PCMU/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-11,16.

U +0.029025 OpenSER:5060 -> UAC:5060
SIP/2.0 100 Giving a try.
Via: SIP/2.0/UDP 192.168.0.126;rport=5060;branch=z9hG4bKc0a8007e000000ab464b0e0c00006c7e000005ed;received=UAC.
Call-ID: 0ED32AD0-3691-44D8-9E19-A32F5C913F43@192.168.0.126.
CSeq: 2 INVITE.
From: "unknown"<sip:9492666205@sip.demo.com:5060>;tag=21354640612611.
To: <sip:*721111111111@sip.demo.com:5060>.
Server: OpenSER (1.3.0-dev4-notls (x86_64/linux)).
Content-Length: 0.
Warning: 392 OpenSER:5060 "Noisy feedback tells:  pid=19269 req_src_ip=UAC req_src_port=5060 in_uri=sip:*721111111111@sip.demo.com:5060 out_uri=sip:call_forward_enable@OpenSER:5070 via_cnt==1".
.


U +0.000233 OpenSER:5060 -> UAC:5060
SIP/2.0 500 Server error occurred (1/SL).
Via: SIP/2.0/UDP 192.168.0.126;rport=5060;branch=z9hG4bKc0a8007e000000ab464b0e0c00006c7e000005ed;received=UAC.
Call-ID: 0ED32AD0-3691-44D8-9E19-A32F5C913F43@192.168.0.126.
CSeq: 2 INVITE.
From: "unknown"<sip:9492666205@sip.demo.com:5060>;tag=21354640612611.
To: <sip:*721111111111@sip.demo.com:5060>;tag=329cfeaa6ded039da25ff8cbb8668bd2.a0a9.
Server: OpenSER (1.3.0-dev4-notls (x86_64/linux)).
Content-Length: 0.
Warning: 392 OpenSER:5060 "Noisy feedback tells:  pid=19269 req_src_ip=UAC req_src_port=5060 in_uri=sip:*721111111111@sip.demo.com:5060 out_uri=sip:+1call_forward_enable@4.79.212.236:5060 via_cnt==1".
.