Phone1                                             OpenSer                                            Asterisk                                           Phone2
|                                                  |                                                  |                                                  | <Call><PFrame><Time>
|                                                  |                                                  |                                                  |
| F1 INVITE (sdp)                                  |                                                  |                                                  |
|>------------------------------------------------>|                                                  |                                                  |  1 PF:1   16:09:17.8310
|                                                  |                                                  |                                                  |
|    trying -- your call is important to us 100 F2 |                                                  |                                                  |
|<------------------------------------------------<|                                                  |                                                  |  1 PF:2   16:09:17.8313
|                                                  |                                                  |                                                  |
|                                                  | F3 INVITE (sdp)                                  |                                                  |
|                                                  |>--------------------------------------------------------------------------------------------------->|  1 PF:3   16:09:17.8314
|                                                  |                                                  |                                                  |
|                                                  | F4 INVITE (sdp)                                  |                                                  |
|                                                  |>--------------------------------------------------------------------------------------------------->|  1 PF:4   16:09:17.8784
|                                                  |                                                  |                                                  |
|                                                  |                                                  |                                    Trying 100 F5 |
|                                                  |<---------------------------------------------------------------------------------------------------<|  1 PF:5   16:09:18.1351
|                                                  |                                                  |                                                  |
|                                                  |                                                  |                                    Trying 100 F6 |
|                                                  |<---------------------------------------------------------------------------------------------------<|  1 PF:6   16:09:18.2805
|                                                  |                                                  |                                                  |
|                                                  |                                                  |                                   Ringing 180 F7 |
|                                                  |<---------------------------------------------------------------------------------------------------<|  1 PF:7   16:09:18.4531
|                                                  |                                                  |                                                  |
|                                   Ringing 180 F8 |                                                  |                                                  |
|<------------------------------------------------<|                                                  |                                                  |  1 PF:8   16:09:18.4531
|                                                  |                                                  |                                                  |
| F9 (sip incomplete) >>>                          |                                                  |                                                  |
|>------------------------------------------------>|                                                  |                                                  |  1 PF:9   16:09:23.9775
|                                                  |                                                  |                                                  |
|                                                  |                                                  |                         <<< (sip incomplete) F10 |
|                                                  |<---------------------------------------------------------------------------------------------------<|  2 PF:10  16:09:26.7349
|                                                  |                                                  |                                                  |
|                                                  | F11 INVITE (sdp)                                 |                                                  |
|                                                  |>------------------------------------------------>|                                                  |  1 PF:11  16:09:32.9069
|                                                  |                                                  |                                                  |
|                                                  | F12 CANCEL                                       |                                                  |
|                                                  |>--------------------------------------------------------------------------------------------------->|  1 PF:12  16:09:32.9069
|                                                  |                                                  |                                                  |
|                                                  |            Proxy Authentication Required 407 F13 |                                                  |
|                                                  |<------------------------------------------------<|                                                  |  1 PF:13  16:09:32.9071
|                                                  |                                                  |                                                  |
|                                                  | F14 ACK                                          |                                                  |
|                                                  |>------------------------------------------------>|                                                  |  1 PF:14  16:09:32.9072
|                                                  |                                                  |                                                  |
|            Proxy Authentication Required 407 F15 |                                                  |                                                  |
|<------------------------------------------------<|                                                  |                                                  |  1 PF:15  16:09:32.9072
|                                                  |                                                  |                                                  |
| F16 ACK                                          |                                                  |                                                  |
|>------------------------------------------------>|                                                  |                                                  |  1 PF:16  16:09:33.0940
|                                                  |                                                  |                                                  |
| F17 INVITE (sdp)                                 |                                                  |                                                  |
|>------------------------------------------------>|                                                  |                                                  |  1 PF:17  16:09:33.3866
|                                                  |                                                  |                                                  |
|   trying -- your call is important to us 100 F18 |                                                  |                                                  |
|<------------------------------------------------<|                                                  |                                                  |  1 PF:18  16:09:33.3869
|                                                  |                                                  |                                                  |
|                                                  | F19 INVITE (sdp)                                 |                                                  |
|                                                  |>--------------------------------------------------------------------------------------------------->|  1 PF:19  16:09:33.3869
|                                                  |                                                  |                                                  |
|                                                  |                                                  |                                       OK 200 F20 |
|                                                  |<---------------------------------------------------------------------------------------------------<|  1 PF:20  16:09:33.5315
|                                                  |                                                  |                                                  |
|                                                  |                                                  |                       Request Terminated 487 F21 |
|                                                  |<---------------------------------------------------------------------------------------------------<|  1 PF:21  16:09:33.6770
|                                                  |                                                  |                                                  |
|                                                  | F22 ACK                                          |                                                  |
|                                                  |>--------------------------------------------------------------------------------------------------->|  1 PF:22  16:09:33.6771
|                                                  |                                                  |                                                  |
|                                                  |                                                  |                       Request Terminated 487 F23 |
|                                                  |<---------------------------------------------------------------------------------------------------<|  1 PF:23  16:09:33.9060
|                                                  |                                                  |                                                  |
|                                                  | F24 ACK                                          |                                                  |
|                                                  |>--------------------------------------------------------------------------------------------------->|  1 PF:24  16:09:33.9061
|                                                  |                                                  |                                                  |
|                                                  | F25 INVITE (sdp)                                 |                                                  |
|                                                  |>--------------------------------------------------------------------------------------------------->|  1 PF:25  16:09:33.9085
|                                                  |                                                  |                                                  |
|                                                  |                                                  |                                   Trying 100 F26 |
|                                                  |<---------------------------------------------------------------------------------------------------<|  1 PF:26  16:09:34.0484
|                                                  |                                                  |                                                  |
|                                                  |                                                  |                                  Ringing 180 F27 |
|                                                  |<---------------------------------------------------------------------------------------------------<|  1 PF:27  16:09:34.2206
|                                                  |                                                  |                                                  |
|                                  Ringing 180 F28 |                                                  |                                                  |
|<------------------------------------------------<|                                                  |                                                  |  1 PF:28  16:09:34.2206
|                                                  |                                                  |                                                  |
|                                                  |                                                  |                                  Ringing 180 F29 |
|                                                  |<---------------------------------------------------------------------------------------------------<|  1 PF:29  16:09:34.4196
|                                                  |                                                  |                                                  |
|                                  Ringing 180 F30 |                                                  |                                                  |
|<------------------------------------------------<|                                                  |                                                  |  1 PF:30  16:09:34.4196
|                                                  |                                                  |                                                  |
| F31 (sip fragment) >>>                           |                                                  |                                                  |
|>------------------------------------------------>|                                                  |                                                  |  1 PF:31  16:09:43.9851
|                                                  |                                                  |                                                  |
|                                                  | F32 INVITE (sdp)                                 |                                                  |
|                                                  |>------------------------------------------------>|                                                  |  1 PF:33  16:09:48.9373
|                                                  |                                                  |                                                  |
|                                                  | F33 CANCEL                                       |                                                  |
|                                                  |>--------------------------------------------------------------------------------------------------->|  1 PF:34  16:09:48.9373