recontructed message which caused a core-dumop from msg_qa

test/sg.sip

@@ -0,0 +1,18 @@
+INVITE sip:[email protected] SIP/2.0
+Via: SIP/2.0/UDP sipproxy.icr.a-star.edu.sg:5060;branch=QdqKUsYZOGRR+j*P
+Via: SIP/2.0/UDP 137.132.31.151:58072;branch=NTg2NTIwNzUw
+Max-Forwards: 68
+From: sip:[email protected]:6060;tag=MTU3MT
+To: sip:[email protected]
+Call-ID: 1953014-jQ4MzYwNzUw-2137014
+CSeq: 123456 INVITE
+Contact: <sip:[email protected]:58072>
+Content-Type: application/sdp
+Content-Length: 153
+
+v=0
+o=User 1589702922991241424 1420814338471844940 IN IP4 137.132.31.151
+s=
+c=IN IP4 137.132.31.151 UNHOLD UNHOLD
+m=audio 58074 RTP/AVP 0 
+a=rtpmap:0 PCMU/8000