|Time     | 192.168.0.251     | 10.20.142.140     | 10.20.142.151     |
|273,642  |         INVITE SDP ( g711A telephone-event)          |                   |SIP From: sip:445526098300@sip.tng.de To:sip:1234097428@sip.domain.de
|         |(5060)   ------------------>  (5060)   |                   |
|273,659  |         401 Unauthorized              |                   |SIP Status
|         |(5060)   <------------------  (5060)   |                   |
|273,659  |         ACK       |                   |                   |SIP Request
|         |(5060)   ------------------>  (5060)   |                   |
|273,659  |         INVITE SDP ( g711A telephone-event)          |                   |SIP From: sip:44526098300@sip.domain.de To:sip:1234097428@sip.domain.de
|         |(5060)   ------------------>  (5060)   |                   |
|273,689  |         100 Giving a try              |                   |SIP Status
|         |(5060)   <------------------  (5060)   |                   |
|275,308  |         183 Session Progress SDP ( g711A telephone-eve...          |                   |SIP Status
|         |(5060)   <------------------  (5060)   |                   |
|275,315  |         RTP (g711A)                   |                   |RTP Num packets:688  Duration:13.763s SSRC:0x2162742D
|         |(11166)  <--------------------------------------  (5612)   |
|278,207  |         180 Ringing                   |                   |SIP Status
|         |(5060)   <------------------  (5060)   |                   |
|283,320  |         200 OK SDP ( g711A telephone-event)          |                   |SIP Status
|         |(5060)   <------------------  (5060)   |                   |
|283,320  |         ACK       |                   |                   |SIP Request
|         |(5060)   ------------------>  (5060)   |                   |
|289,068  |         BYE       |                   |                   |SIP Request
|         |(5060)   ------------------>  (5060)   |                   |
|289,095  |         200 OK    |                   |                   |SIP Status
|         |(5060)   <------------------  (5060)   |                   |