Disconnect after 30 seconds

Has anyone else had any issues with calls disconnecting/dropping after 30 seconds? I'm using a DPH-140S and I'm not sure if my configuration is wrong or what but do I need to enable the BYOD option in the VPanel? Can someone also confirm what I should have my session refresh and session timer method set to?

Session Refresher
None (disable SIP session timer support)
UAC (to initiate SIP request)
UAS (receive SIP request and then return a response)

Session Timer Method
Invite (default)
Update

Thanks!

Sounds like you know more abt the device than I do, but I had a similar problem (32 seconds) with an ActionTec router from verizon. I was able to talk verizon into sending another model router/dsl modem and voipo works. Although on this new router there is no QOS setting to give voip priority. here is where I was looking for suggestions: http://forums.voipo.com/showthread.php?t=1566