Background: We have a i2004 that connects to our vpn through a 4 port\nlinux router. We are running a BCM\nv 3.6 build 2.2c.\n\nProblem :Hey everyone, Im having a issue where my ip phone is\nperiodically not recieving a dialtone/voice on either side of the phone\nconnection. The ip phone does register and can make outgoing calls but\nwill sometimes have no voice or dialtone.\n\nlink to schematic:\n[URL]http://www.thestreetwise.com/compujesus/network-schema.jpg[/URL]\n\nMy diagnosis and things ive tried:\nAt first i thought that the problem was with the firewall on the\nlinux router. so i started by adding adding the following lines inside\nof my firewall.user file to direct the vpn traffic:\n\niptables -A forwarding_rule -o ppp0 -j ACCEPT\niptables -A forwarding_rule -i ppp0 -j ACCEPT\niptables -t nat -A postrouting_rule -o ppp0 -j MASQUERADE\n\nThen i read that the registration of the ip phone is done through port\nudp 7000. so i added the appropriate line inside of my firewall.user\nand tried again. success the phone registered but i had no voice\ntraffic. I then added a line to direct port traffic 51000:51255 (Im\nsorry im not posting the iptable commands for this as i am not verry\ngood with the whole structure of linux iptables and chains.)\n.. After doing this i recieved dialtone initially but after about 10\nminutes or so i checked again and the dialtone and voice was gone. So\nthen i tried to make a outgoing call and a incomming call and both\nworked, but still no voice.\n\nNow im stumped, i feel like ive tried soo much to get this to work and\nnow need the help of someone more experienced to either help with my\niptables or to give me some insight on what im doing wrong. THANK YOU\nEVERYONE WHO HELPS IVE BEEN STRESSING OVER THIS FOR A WHILE. THANKS!