|Time     | 81.XX.XX.XX      | 83.XX.XX.XX      |
|2,820    |         INVITE SDP ( telephone-event)          |SIP From: sip:0326XXXXXX@voip-centrex.XX To:sip:0805701010@sip2.operator
|         |(5060)   ------------------>  (5060)   |
|2,827    |         401 Unauthorized              |SIP Status
|         |(5060)   <------------------  (5060)   |
|2,827    |         ACK       |                   |SIP Request
|         |(5060)   ------------------>  (5060)   |
|2,827    |         INVITE SDP ( telephone-event)          |SIP From: sip:0326XXXXXX@voip-centrex.XX To:sip:0805701010@sip2.operator
|         |(5060)   ------------------>  (5060)   |
|2,835    |         100 Trying|                   |SIP Status
|         |(5060)   <------------------  (5060)   |
|3,326    |         183 Session Progress SDP ( telephone-event)          |SIP Status
|         |(5060)   <------------------  (5060)   |
|3,390    |         RTP (g711U)                   |RTP Num packets:57  Duration:1.119s SSRC:0x1F8C28DA
|         |(18344)  ------------------>  (12432)  |
|4,243    |         RTP (g711U)                   |RTP Num packets:15  Duration:0.280s SSRC:0x2CA92AC1
|         |(18344)  <------------------  (12432)  |
|4,322    |         180 Ringing                   |SIP Status
|         |(5060)   <------------------  (5060)   |
|4,525    |         200 OK SDP ( telephone-event)          |SIP Status
|         |(5060)   <------------------  (5060)   |
|4,526    |         ACK       |                   |SIP Request
|         |(5060)   ------------------>  (5060)   |
|4,530    |         RTP (g711U)                   |RTP Num packets:9  Duration:0.159s SSRC:0x1B7B
|         |(18344)  ------------------>  (12432)  |
|4,883    |         RTP (g711U)                   |RTP Num packets:107  Duration:2.119s SSRC:0x1D3848FA
|         |(18344)  ------------------>  (12432)  |
|5,041    |         RTP (g711U)                   |RTP Num packets:125  Duration:1.980s SSRC:0x3C75BBDB
|         |(18344)  <------------------  (12432)  |
|7,026    |         BYE       |                   |SIP Request
|         |(5060)   ------------------>  (5060)   |
|7,032    |         200 OK    |                   |SIP Status
|         |(5060)   <------------------  (5060)   |