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SIP peer unreachable

В один прекрасный день сервак в Ялте стал unreachable для Львовского сервака. Быстро создал транки по IAX и стал колупать что с сипом, ведь транк работал долго и верно. Для Ялтинского сервака Львовский сервак - ОК.

СИП дебуг Львовского сервака:

Reliably Transmitting (no NAT) to ххх.207.98.169:5060:
OPTIONS sip:ххх.207.98.169 SIP/2.0
Via: SIP/2.0/UDP ххх.44.193.252:5060;branch=z9hG4bK2074cc7d;rport
From: "Unknown" <sip:Unknown@ххх.44.193.252>;tag=as019b83c3
To: <sip:ххх.207.98.169>
Contact: <sip:Unknown@ххх.44.193.252>
Call-ID: 3b542e400736c0f12700b47e1814623d@ххх.44.193.252
CSeq: 102 OPTIONS
User-Agent: Asterisk PBX
Max-Forwards: 70
Date: Thu, 12 May 2011 11:00:37 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Content-Length: 0

Retransmitting #1 (no NAT) to ххх.207.98.169:5060:
OPTIONS sip:ххх.207.98.169 SIP/2.0
Via: SIP/2.0/UDP ххх.44.193.252:5060;branch=z9hG4bK6705d4ae;rport
From: "Unknown" <sip:Unknown@ххх.44.193.252>;tag=as22150672
To: <sip:ххх.207.98.169>
Contact: <sip:Unknown@ххх.44.193.252>
Call-ID: 4d788f2f441aad301d19a8623c3c7e40@ххх.44.193.252
CSeq: 102 OPTIONS
User-Agent: Asterisk PBX
Max-Forwards: 70
Date: Thu, 12 May 2011 11:00:37 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Content-Length: 0

Как видно - не получает ответа. Хотя во Львове есть запасной сервер, в той же подсети - он с Ялтой нормально работает.

SIP peer unreachable

СИП дебуг Львовского сервака:

Reliably Transmitting (no NAT) to ххх.207.98.169:5060:
OPTIONS sip:ххх.207.98.169 SIP/2.0
Via: SIP/2.0/UDP ххх.44.193.252:5060;branch=z9hG4bK2074cc7d;rport
From: "Unknown" <sip:Unknown@ххх.44.193.252>;tag=as019b83c3
To: <sip:ххх.207.98.169>
Contact: <sip:Unknown@ххх.44.193.252>
Call-ID: 3b542e400736c0f12700b47e1814623d@ххх.44.193.252
CSeq: 102 OPTIONS
User-Agent: Asterisk PBX
Max-Forwards: 70
Date: Thu, 12 May 2011 11:00:37 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Content-Length: 0

Retransmitting #1 (no NAT) to ххх.207.98.169:5060:
OPTIONS sip:ххх.207.98.169 SIP/2.0
Via: SIP/2.0/UDP ххх.44.193.252:5060;branch=z9hG4bK6705d4ae;rport
From: "Unknown" <sip:Unknown@ххх.44.193.252>;tag=as22150672
To: <sip:ххх.207.98.169>
Contact: <sip:Unknown@ххх.44.193.252>
Call-ID: 4d788f2f441aad301d19a8623c3c7e40@ххх.44.193.252
CSeq: 102 OPTIONS
User-Agent: Asterisk PBX
Max-Forwards: 70
Date: Thu, 12 May 2011 11:00:37 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Content-Length: 0

UPD

Делаю сип релоад и ловлю на Ялте пакеты.

09:17:32.101127 IP (tos 0x60, ttl  64, id 24630, offset 0, flags [none], proto: UDP (17), length: 521) 192.168.0.102.sip > ххх.44.193.252.sip: [bad udp cksum c7a0!] SIP, length: 493
       OPTIONS sip:ххх.44.193.252 SIP/2.0
       Via: SIP/2.0/UDP ххх.207.98.169:5060;branch=z9hG4bK4b258ecd;rport
       From: "Unknown" <sip:Unknown@ххх.207.98.169>;tag=as5d777e65
       To: <sip:ххх.44.193.252>
       Contact: <sip:Unknown@ххх.207.98.169>
       Call-ID: 32168a1a4bb6308d223ee9de67ca4f36@ххх.207.98.169
       CSeq: 102 OPTIONS
       User-Agent: Asterisk PBX
       Max-Forwards: 70
       Date: Fri, 13 May 2011 06:17:32 GMT
       Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
       Supported: replaces
       Content-Length: 0

09:17:32.153759 IP (tos 0x60, ttl  57, id 46849, offset 0, flags [none], proto: UDP (17), length: 507) ххх.44.193.252.sip > 192.168.0.102.sip: [udp sum ok] SIP, length: 479
       SIP/2.0 200 OK
       Via: SIP/2.0/UDP ххх.207.98.169:5060;branch=z9hG4bK4b258ecd;received=ххх.207.98.169;rport=1035
       From: "Unknown" <sip:Unknown@ххх.207.98.169>;tag=as5d777e65
       To: <sip:ххх.44.193.252>;tag=as145bdf10
       Call-ID: 32168a1a4bb6308d223ee9de67ca4f36@ххх.207.98.169
       CSeq: 102 OPTIONS
       User-Agent: Asterisk PBX
       Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
       Supported: replaces
       Contact: <sip:ххх.44.193.252>
       Accept: application/sdp
       Content-Length: 0