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Sonicwall TZ200 Blocking SIP Port 5060 50% of the Time when I have rules open to forward them to the Asterisk Phone System

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Last Modified: 2012-06-21
I am having a problem with my SIP based phone calls getting through my Sonicwall TZ200 to my TrixboxCE Phone System.  I only get my phone system's automated attendant to answer around half the time, the other times the packets are justed dropped.

I am not sure why some UDP port 5060 packets are dropped and other times they are allowed through and forwarded to the Phone system like the NAT Policies are configured.

I have used the Sonicwall's Packet Capture page to capture all packets from my SIP Providers IP Address.  As you can see the first two were dropped and therefor the first two calls never made it to my phone system to initiate the call.  Then packet 3 and 4 were successful port 5060 packets being forwarded to the phone system to set up the call.  

Any Ideas?


*Packet number: 1*
Header Values:
 Bytes captured: 1445, Actual Bytes on the wire: 1445
Packet Info(Time:12/05/2010 19:47:34.480):
 in:X1*(interface), out:--, DROPPED, Drop Code: 37, Module Id: 26, (Ref.Id: _4193_txGsIboemfJqQlu), 0:0)
Ethernet Header
 Ether Type: IP(0x800), Src=[00:1f:e1:7e:7c:92], Dst=[00:17:c5:3f:32:25]
IP Packet Header
 IP Type: UDP(0x11), Src=[SIP Provider], Dst=[My WAN IP]
UDP Packet Header
 Src=[5060], Dst=[1366], Checksum=0x9949, Message Length=1411 bytes
Application Header
 Not Known:
Value:[0]

*Packet number: 2*
Header Values:
 Bytes captured: 1445, Actual Bytes on the wire: 1445
Packet Info(Time:12/05/2010 19:47:36.528):
 in:X1*(interface), out:--, DROPPED, Drop Code: 37, Module Id: 26, (Ref.Id: _4193_txGsIboemfJqQlu), 0:0)
Ethernet Header
 Ether Type: IP(0x800), Src=[00:1f:e1:7e:7c:92], Dst=[00:17:c5:3f:32:25]
IP Packet Header
 IP Type: UDP(0x11), Src=[SIP Provider], Dst=[MY WAN IP]
UDP Packet Header
 Src=[5060], Dst=[1366], Checksum=0x9949, Message Length=1411 bytes
Application Header
 Not Known:
Value:[0]

*Packet number: 3*
Header Values:
 Bytes captured: 739, Actual Bytes on the wire: 739
Packet Info(Time:12/05/2010 19:48:44.448):
 in:--, out:X1*, Forwarded, 0:0)
Ethernet Header
 Ether Type: IP(0x800), Src=[00:17:c5:3f:32:25], Dst=[00:1f:e1:7e:7c:92]
IP Packet Header
 IP Type: UDP(0x11), Src=[MY WAN IP], Dst=[SIP Provider]
UDP Packet Header
 Src=[1366], Dst=[5060], Checksum=0x5367, Message Length=705 bytes
Application Header
 Not Known:
Value:[0]

*Packet number: 4*
Header Values:
 Bytes captured: 436, Actual Bytes on the wire: 436
Packet Info(Time:12/05/2010 19:48:44.480):
 in:X1*(interface), out:X0, Forwarded, 0:0)
Ethernet Header
 Ether Type: IP(0x800), Src=[00:1f:e1:7e:7c:92], Dst=[00:17:c5:3f:32:25]
IP Packet Header
 IP Type: UDP(0x11), Src=[SIP Provider], Dst=[MY WAN IP]
UDP Packet Header
 Src=[5060], Dst=[1366], Checksum=0xab3e, Message Length=402 bytes
Application Header
 Not Known:
Value:[0]
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