Can anyone tell me if it is best to untick (disable) the SIP ALG option on the Genius when using other VOIP services?  It shows as "6. Use SIP ALG option:" under "voip advanced settings".

Currently the vfx service is working fine but I have read on other posts that it might cause a problem if the ALG is enabled.  I have the Orcon VOIP service not enabled on my Genius but is connected to a LAN asterisk which works fine so not using the Genius internal voip service.  I know that's not a supported way of using it :)