|Time     | 192.168.90.2                          |
|         |                   | 192.168.1.20      |                   
|25.485833000|         INVITE SDP (g711U telephone-event)          |SIP From: <sip:701@192.168.1.20;transport=UDP To:<sip:++8801818******@192.168.1.20;transport=UDP
|         |(60572)  ------------------>  (5060)   |
|25.486308000|         401 Unauthorized              |SIP Status
|         |(60572)  <------------------  (5060)   |
|25.998736000|         INVITE SDP (g711U telephone-event)          |SIP From: <sip:701@192.168.1.20;transport=UDP To:<sip:++8801818******@192.168.1.20;transport=UDP
|         |(60572)  ------------------>  (5060)   |
|26.181074000|         ACK       |                   |SIP Request
|         |(60572)  ------------------>  (5060)   |
|26.183454000|         INVITE SDP (g711U telephone-event)          |SIP From: <sip:701@192.168.1.20;transport=UDP To:<sip:++8801818******@192.168.1.20;transport=UDP
|         |(60572)  ------------------>  (5060)   |
|26.187596000|         100 Trying|                   |SIP Status
|         |(60572)  <------------------  (5060)   |
|26.258577000|         183 Session Progress SDP (g711U telephone-event)          |SIP Status
|         |(60572)  <------------------  (5060)   |
|26.679032000|         INVITE SDP (g711U telephone-event)          |SIP From: <sip:701@192.168.1.20;transport=UDP To:<sip:++8801818******@192.168.1.20;transport=UDP
|         |(60572)  ------------------>  (5060)   |
|26.679364000|         100 Trying|                   |SIP Status
|         |(60572)  <------------------  (5060)   |
|26.919279000|         RTP (Unassigned)              |RTP Num packets:1  Duration:0.000s SSRC:0x1430536E
|         |(48400)  ------------------>  (18990)  |
|28.577117000|         RTP (g711U)                   |RTP Num packets:493  Duration:10.412s SSRC:0x1430536E
|         |(48400)  ------------------>  (18990)  |
|38.359872000|         503 Service Unavailable          |SIP Status
|         |(60572)  <------------------  (5060)   |
|38.997611000|         ACK       |                   |SIP Request
|         |(60572)  ------------------>  (5060)   |