I'm using Shibby Tomato Firmware 1.28.0000 MIPSR2-101 K26 USB AIO on my Cisco E4200. Every couple minutes when I am talking the person on the other end can no longer hear me. After about 10 to 20 seconds, it comes back and they can hear. I am running a PBX voip I changed my UDP timeouts to 30-120 and my NAT interval on my phones is 90 seconds. Do I possibly need to port forward ports 5060-5061 and rtp 10000-20000 to the PBX wan ip? I should also state that cisco stock firmware works fine and no dropouts, but I need tomato for the QOS piece.