Allworx 6x with Fortinet/Fortigate No Audio

[amazingtim]

We have a Main office with a Forigate 60D and Remote office with a Fortigate 30D.

Main Office Network has the 6x and is in LAN Host mode on the 192.168.99.x network
Remote Office has a 9212 on its LAN and network is 192.168.100.x, with phone ip of 192.168.100.101

We are using them all behind a site-to-site VPN.
The problem is incoming calls from the Main Office have no problem, and audio is fine etc.
Outgoing calls from the Remote Office have no audio (not even one way audio)

I did the following commands on the Fortigate CLI from the dashboard to disable SIP ALG etc.
1) Enter the following commands in FortiGate’s CLI:
config system settings
set sip-helper disable
set sip-nat-trace disable
reboot the device

2) Reopen CLI and enter the following commands – do not enter the text after //:
config system session-helper
show //locate the SIP entry, usually 12, but can vary.
delete 12 //or the number that you identified from the previous command.
Disable RTP processing as follows:
config voip profile
edit default
config sip
set rtp disable

Still no audio on the Remote phone (outbound calls only) - Calls incoming are fine.

One more interesting fact is on the Handset registration, it is showing 192.168.99.1:65476, instead of what I would think would be 192.168.100.101:5060

Any ideas or insight is appreciated.