sterisk3# ngrep -Tn 60 -Wbyline port 5060 | ./sip-dump.pl
 0.000000| 10.251.1.21:5060       > 10.252.15.24:5060
         | CSeq: 1 INVITE.        > 
         | CMD: INVITE 71         > 
         |
 0.000024| 10.251.1.21:5060       < 10.252.15.24:5060
         |                        < CSeq: 1 INVITE.
         |                        < RES: 407 Proxy Authentication Required
         |
 0.058081| 10.251.1.21:5060       > 10.252.15.24:5060
         | CSeq: 1 ACK.           > 
         | CMD: ACK 71            > 
         |
 0.103653| 10.251.1.21:5060       > 10.252.15.24:5060
         | CSeq: 2 INVITE.        > 
         | CMD: INVITE 71         > 
         |
 0.103684| 10.251.1.21:5060       < 10.252.15.24:5060
         |                        < CSeq: 2 INVITE.
         |                        < RES: 100 Trying
         |
 0.110174|                          10.252.15.24:5060      > 10.252.11.130:5060
         |                          CSeq: 102 INVITE.      > 
         |                          CMD: INVITE 9096       > 
         |
 0.110784|                          10.252.15.24:5060      < 10.252.11.130:5060
         |                                                 < CSeq: 102 INVITE.
         |                                                 < RES: 100 Trying
         |
 0.134189|                          10.252.15.24:5060      < 10.252.11.130:5060
         |                                                 < CSeq: 102 INVITE.
         |                                                 < RES: 180 Ringing
         |
 0.137317| 10.251.1.21:5060       < 10.252.15.24:5060
         |                        < CSeq: 2 INVITE.
         |                        < RES: 180 Ringing
         |
 2.054644|                          10.252.15.24:5060      < 10.252.11.130:5060
         |                                                 < CSeq: 102 INVITE.
         |                                                 < RES: 200 OK
         |
 2.055301|                          10.252.15.24:5060      > 10.252.11.130:5060
         |                          CSeq: 102 ACK.         > 
         |                          CMD: ACK 9096          > 
         |
 2.056956| 10.251.1.21:5060       < 10.252.15.24:5060
         |                        < CSeq: 2 INVITE.
         |                        < RES: 200 OK
         |
 2.059413|                          10.252.15.24:5060      > 10.252.11.130:5060
         |                          CSeq: 103 INVITE.      > 
         |                          CMD: INVITE 9096       > 
         |
 2.061475|                          10.252.15.24:5060      < 10.252.11.130:5060
         |                                                 < CSeq: 103 INVITE.
         |                                                 < RES: 100 Trying
         |
 2.062990|                          10.252.15.24:5060      < 10.252.11.130:5060
         |                                                 < CSeq: 103 INVITE.
         |                                                 < RES: 200 OK
         |
 2.063058|                          10.252.15.24:5060      > 10.252.11.130:5060
         |                          CSeq: 103 ACK.         > 
         |                          CMD: ACK 9096          > 
         |
 2.171961| 10.251.1.21:5060       > 10.252.15.24:5060
         | CSeq: 2 ACK.           > 
         | CMD: ACK 71            > 
         |
 2.171973| 10.251.1.21:5060       < 10.252.15.24:5060
         |                        < CSeq: 102 INVITE.
         |                        < CMD: INVITE edwin
         |
 2.234214| 10.251.1.21:5060       > 10.252.15.24:5060
         | CSeq: 102 INVITE.      > 
         | RES: 200 OK            > 
         |
 2.234225| 10.251.1.21:5060       < 10.252.15.24:5060
         |                        < CSeq: 102 ACK.
         |                        < CMD: ACK edwin
         |
 5.333973|                          10.252.15.24:5060      < 10.252.11.130:5060
         |                                                 < CSeq: 101 BYE.
         |                                                 < CMD: BYE edwin
         |
 5.334882|                          10.252.15.24:5060      > 10.252.11.130:5060
         |                          CSeq: 101 BYE.         > 
         |                          RES: 200 OK            > 
         |
 5.334898| 10.251.1.21:5060       < 10.252.15.24:5060
         |                        < CSeq: 103 INVITE.
         |                        < CMD: INVITE edwin
         |
 5.492500| 10.251.1.21:5060       > 10.252.15.24:5060
         | CSeq: 103 INVITE.      > 
         | RES: 200 OK            > 
         |
 5.492516| 10.251.1.21:5060       < 10.252.15.24:5060
         |                        < CSeq: 103 ACK.
         |                        < CMD: ACK edwin
         |
 5.492518| 10.251.1.21:5060       < 10.252.15.24:5060
         |                        < CSeq: 104 BYE.
         |                        < CMD: BYE edwin
         |