|Time     | 10.121.1.251      | 10.121.1.252      | 10.121.1.104      |
|0.936    |         INVITE SDP ( h263-1998)          |                   |SIP From: sip:3515702677@10.121.1.251 To:sip:3515702614@10.121.1.252
|         |(15557)  ------------------>  (5060)   |                   |
|1.054    |                   |         INVITE SDP ( h263-1998)          |SIP Request
|         |                   |(5060)   ------------------>  (2829)   |
|1.162    |                   |         100 Trying|                   |SIP Status
|         |                   |(5060)   <------------------  (2829)   |
|1.271    |                   |         180 Ringing                   |SIP Status
|         |                   |(5060)   <------------------  (2829)   |
|1.275    |         180 Ringing                   |                   |SIP Status
|         |(15557)  <------------------  (5060)   |                   |
|20.746   |         408 Request Timeout           |                   |SIP Status
|         |(15557)  <------------------  (5060)   |                   |
|20.747   |         ACK       |                   |                   |SIP Request
|         |(15557)  ------------------>  (5060)   |                   |
|20.784   |         BYE       |                   |                   |SIP Request
|         |(15557)  ------------------>  (5060)   |                   |
|20.855   |                   |         CANCEL    |                   |SIP Request
|         |                   |(5060)   ------------------>  (2829)   |
|20.856   |         404 Not here                  |                   |SIP Status
|         |(15557)  <------------------  (5060)   |                   |
|20.858   |                   |         200 OK    |                   |SIP Status
|         |                   |(5060)   <------------------  (2829)   |
|20.896   |                   |         487 Request Terminated          |SIP Status
|         |                   |(5060)   <------------------  (2829)   |
|20.900   |                   |         ACK       |                   |SIP Request
|         |                   |(5060)   ------------------>  (2829)   |