15:28:28.920_1226[e2c]:SIPEngine:: 
SIPTransportMgr::transmit(SIPMessageEntry): retry=0, handle=213830,
address=128.1.90.20:5060
INVITE sip:3173590176@128.1.90.20:5060 SIP/2.0
To: <sip:3173590176@128.1.90.20>;tag=D50183FE-13FC
From: <sip:2648777@10.80.1.6>;tag=26553
Call-ID: CE78D2F3-FE1311D9-927CB533-2E5D31C@128.1.90.20
CSeq: 105 INVITE
Via: SIP/2.0/UDP 10.1.1.80:5061
Contact: <sip:2648777@10.1.1.80:5061>
User-Agent: ININ-cgceic-107711238
Accept: application/sdp
Accept-Encoding: identity
Content-Type: application/sdp
Content-Length: 196

v=0
o=ININ 801680312 801680312 IN IP4 10.1.1.80
s=Interaction
c=IN IP4 10.80.1.5
t=0 0
m=audio 4390 RTP/AVP 18 101
a=rtpmap:18 G729/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15

15:28:28.920_1300[e08]:SIPEngine::SIPTransport::recv(): remote=128.1.90.20, message=
SIP/2.0 481 Invalid CSeq Number
Via: SIP/2.0/UDP 10.1.1.80:5061;received=10.80.1.6
From: <sip:2648777@10.80.1.6>;tag=26553
To: <sip:3173590176@128.1.90.20>;tag=D50183FE-13FC
Call-ID: CE78D2F3-FE1311D9-927CB533-2E5D31C@128.1.90.20
CSeq: 105 INVITE
Content-Length: 0


15:28:28.936_1310[1398]:SIPEngine:: 
SIPTransportMgr::transmit(SIPMessageEntry): retry=0, handle=213831,
address=128.1.90.20:5060
ACK sip:3173590176@128.1.90.20:5060 SIP/2.0
To: <sip:3173590176@128.1.90.20>;tag=D50183FE-13FC
From: <sip:2648777@10.80.1.6>;tag=26553
Call-ID: CE78D2F3-FE1311D9-927CB533-2E5D31C@128.1.90.20
CSeq: 105 ACK
Via: SIP/2.0/UDP 10.1.1.80:5061
User-Agent: ININ-cgceic-107711238
Content-Length: 0