Router Info
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Mikrotik
This router has an ALG that can be disabled with the following command
/ip firewall service-port disable sip
The info was found at the following two links Mikrotik Wiki Mikrotik Forum
Fortigate
I found this online about solving issues with Fortigate routers and NO AUDIO with remote SIP:
In the command line of the fortigate type the following:
config system settings
set sip-helper disable
set sip-nat-trace disable
Reboot the device
In the command line type the following:
config system session-helper
show
(now look for SIP, mostly it will be "12")
delete 12
Don't use any protection profiles on the firewall of the sip rules.