Hello!

   I am trying to do some load tests using Sipp with an authentication scenario. I can stablish one call using sipp as UAC but I receive continuously 407 SIP messages requiring authenticate. I've got one tcpdump capture:

|Time     | 192.168.2.230                         |
|         |                   | 192.168.2.235     |                  
|0,000    |         INVITE SDP ( g711U)           |SIP From: sip:sipp@192.168.2.230:5061 To:sip:9999@192.168.2.235:5060
|         |(5061)   ------------------>  (5060)   |
|0,001    |         100 Trying|                   |SIP Status
|         |(5061)   <------------------  (5060)   |
|0,021    |         407 Proxy Authentication Required          |SIP Status
|         |(5061)   <------------------  (5060)   |
|0,022    |         ACK       |                   |SIP Request
|         |(5061)   ------------------>  (5060)   |
|0,023    |         INVITE SDP ( g711U)           |SIP From: sip:sipp@192.168.2.230:5061 To:sip:9999@192.168.2.235:5060
|         |(5061)   ------------------>  (5060)   |
|0,024    |         100 Trying|                   |SIP Status
|         |(5061)   <------------------  (5060)   |
|0,190    |         200 OK SDP ( g711U telephone-event)          |SIP Status
|         |(5061)   <------------------  (5060)   |
|0,190    |         ACK       |                   |SIP Request
|         |(5061)   ------------------>  (5060)   |
|0,191    |         RTP (g711A)                   |RTP Num packets:236  Duration:7.051s SSRC:0xDEE0EE8F
|         |(6000)   ------------------>  (2645)   |
|0,194    |         RTP (g711U)                   |RTP Num packets:611  Duration:12.199s SSRC:0x5594757F
|         |(6000)   <------------------  (26456)  |
|0,194    |         RTP (g711U)                   |RTP Num packets:611  Duration:12.200s SSRC:0x5594757F
|         |(6000)   ------------------>  (26456)  |
|0,523    |         407 Proxy Authentication Required          |SIP Status
|         |(5061)   <------------------  (5060)   |
|0,525    |         ACK       |                   |SIP Request
|         |(5061)   ------------------>  (5060)   |
|1,524    |         407 Proxy Authentication Required          |SIP Status
|         |(5061)   <------------------  (5060)   |
|1,524    |         ACK       |                   |SIP Request
|         |(5061)   ------------------>  (5060)   |
|3,524    |         407 Proxy Authentication Required          |SIP Status
|         |(5061)   <------------------  (5060)   |
|3,524    |         ACK       |                   |SIP Request
|         |(5061)   ------------------>  (5060)   |
|7,524    |         407 Proxy Authentication Required          |SIP Status
|         |(5061)   <------------------  (5060)   |
|7,524    |         ACK       |                   |SIP Request
|         |(5061)   ------------------>  (5060)   |
|10,193   |         BYE       |                   |SIP Request
|         |(5061)   ------------------>  (5060)   |
|10,194   |         481 Call Does Not Exist          |SIP Status
|         |(5061)   <------------------  (5060)   |
|10,196   |         BYE       |                   |SIP Request
|         |(5061)   ------------------>  (5060)   |
|10,197   |         481 Call Does Not Exist          |SIP Status
|         |(5061)   <------------------  (5060)   |
|11,529   |         407 Proxy Authentication Required          |SIP Status
|         |(5061)   <------------------  (5060)   |



I respond with a new INVITE to first 407 received and RTP channels get connected but one and other 407 messages arrives during call and when I try to send BYE FS tells that call does not exists. 407 messages referes to first INVITE (Cseq=1). Any idea where the problem is?

Regards