i dont think ALL Voip apps but some in a sense Im a mitel Dealer and THE oddest thing (THESE are just plug and play phones anywhere (kinkos) Mcdonalds)
Plugging mitel phones in the router (firewall LOWEST seting) DMZ set to the IP TRIED static setting
In the Configuration file i saw (LOCAL LAN HOST ONLY(1) which 1 means true
and it had syn/snt SYN/RECV 0/4 so i know its not sending out any ports and with reading this post ALOT of other people are having this same issue
now i have a westell and not a actiontech i believe they released a firmware version for that unit but now im just trying to figure out why on how that there would be an issue for just a simple Plug N play device ....