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