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RV180 ALG blocks inbound sip messages

Hi,

I have a sip gateway connect to the LAN side of RV180 router which has ALG enabled.  I have no problem to make and receive calls but sometime I see the router does not forward the 'Bye' message from the VOIP service provider to the sip gateway.

Attached a wireshark capture on both WAN and LAN of RV180.

     sip gateway ip: 192.168.30.100

     RV180 WAN ip: 206.108.192.53

     VOIP provider ip: 66.237.65.67 and 65.175.129.133

In the capture frame 4292, a 'Bye' message reaches the WAN of RV180 but it never forward the 'Bye' to the sip gateway with internal ip

All settings in RV180 are default with only ALG enabled.

I tried to setup Access Rule or Port Forward but none seems to work.  Not sure if they are over-ruled by ALG?

With ALG enabled, is it possible to have individual Access Rule?  If there are conflicts between ALG and Access Rule, which has higer priority?         

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