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?

Topic bump, as the behaviour has begun occurring again.
My ISA550w has once again begun silently filtering inbound SIP UDP OPTIONS messages, which are used by my trunk provider to verify that my VOIP switch is alive and responding.
As stated above, ACL rules explicitly permit the forwarding of this traffic to my VOIP switch, which resides behind the firewall.
From time to time, and apparently for no reason at all, the firewall begins silently dropping this traffic. No hits are recorded in the firewall logs despite the fact that logging of this traffic is turned on.
Previously, disabling all security services appeared to deal with this. In addition, all "attack protection" options have been turned off.
I can see that the UDP traffic from my SIP provider is hitting the firewall and getting dropped, as it pops up in packet captures run on the WAN1 interface. When the ISA550w is displaying this behaviour, the traffic is not forwarded to the VOIP switch.
The only "fix," such as it is, for this product is to reset the configuration to factory defaults and then restore the set config from XML backup.
In addition, occasionally the SSL VPN for our remote phones dies, producing timeouts on connect. The box again needs to be reset -- albeit without uploading the config -- to fix this.
Whatever it is, it's a bug, the type of which does not present itself on "real" IOS devices. Once those are configured properly, they stay configured properly.
If anyone can recommend a "real" IOS box with the same feature set as this piece of junk, I would appreciate it. I'd also happily buy a firewall product from any competitor so long as it presents a compatible SSL VPN server capable of being accessed by the SPA525G2 phone.
Ugh.

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dial-peer voice 1 voip
description **Calls to ASTERISK **
destination-pattern 9T
session protocol sipv2
session target sip-server
codec g711ulaw
sip-ua
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yes, but credentials command configure credentials that are used when Cisco UA must register in a server.
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