К сожалению ни tcpdump ни wireshark понимания не прибавляет.
11:34:53.890881 IP (tos 0x0, ttl 62, id 45610, offset 0, flags [DF], proto TCP (6), length 60)
172.30.0.82.58420 > asterisk.sip: Flags [S], cksum 0x6a80 (correct), seq 1639430397, win 65535, options [mss 1216,sackOK,TS val 1303841495 ecr 0,nop,wscale 13], length 0
11:34:53.890913 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 60)
asterisk.sip > 172.30.0.82.58420: Flags [S.], cksum 0x7360 (incorrect -> 0x2284), seq 3815392592, ack 1639430398, win 28960, options [mss 1460,sackOK,TS val 130327901 ecr 1303841495,nop,wscale 7], length 0
11:34:53.937304 IP (tos 0x0, ttl 62, id 45611, offset 0, flags [DF], proto TCP (6), length 52)
172.30.0.82.58420 > asterisk.sip: Flags [.], cksum 0xc24f (correct), seq 1, ack 1, win 22, options [nop,nop,TS val 1303841506 ecr 130327901], length 0
11:34:53.937932 IP (tos 0x0, ttl 62, id 45612, offset 0, flags [DF], proto TCP (6), length 998)
172.30.0.82.58420 > asterisk.sip: Flags [P.], cksum 0xeda6 (correct), seq 1:947, ack 1, win 22, options [nop,nop,TS val 1303841506 ecr 130327901], length 946
11:34:53.937961 IP (tos 0x0, ttl 64, id 57565, offset 0, flags [DF], proto TCP (6), length 52)
asterisk.sip > 172.30.0.82.58420: Flags [.], cksum 0x7358 (incorrect -> 0xbd8a), seq 1, ack 947, win 249, options [nop,nop,TS val 130327949 ecr 1303841506], length 0
11:34:53.938598 IP (tos 0x0, ttl 64, id 57566, offset 0, flags [DF], proto TCP (6), length 641)
asterisk.sip > 172.30.0.82.58420: Flags [P.], cksum 0x75a5 (incorrect -> 0x72e5), seq 1:590, ack 947, win 249, options [nop,nop,TS val 130327949 ecr 1303841506], length 589
11:34:53.985069 IP (tos 0x0, ttl 62, id 45613, offset 0, flags [DF], proto TCP (6), length 52)
172.30.0.82.58420 > asterisk.sip: Flags [.], cksum 0xbc14 (correct), seq 947, ack 590, win 22, options [nop,nop,TS val 1303841518 ecr 130327949], length 0
11:34:53.986027 IP (tos 0x0, ttl 62, id 45614, offset 0, flags [DF], proto TCP (6), length 425)
172.30.0.82.58420 > asterisk.sip: Flags [P.], cksum 0xc6e4 (correct), seq 947:1320, ack 590, win 22, options [nop,nop,TS val 1303841519 ecr 130327949], length 373
11:34:54.025918 IP (tos 0x0, ttl 64, id 57567, offset 0, flags [DF], proto TCP (6), length 52)
asterisk.sip > 172.30.0.82.58420: Flags [.], cksum 0x7358 (incorrect -> 0xb954), seq 590, ack 1320, win 264, options [nop,nop,TS val 130328037 ecr 1303841519], length 0
Господа, готов кто-нибудь помочь на материальной основе?