New user..problem in set up

[qwert97]

I recently ordered the config file and ATA device from Freephoneline. I plugged it into my router and had the dial tone. I tried calling someone and the call does not go through. At that time for inward calls I could not hear the other party. So I forwarded UDP ports 5060-5061, 13000-13001, 6060-6061 so I could hear the other party when someone calls.

My problem is that when I call someone there is a silence and nothing happens. I am using Grandstream with Airport extreme router. The only change I have made is that under DHCP I am using ATA device with static IP address,

[bridonca]

What do you have for a modem? Some modems act as a router, which only adds to the hurt. You only need two ports for the Grandstream. Port 5060 or 5062 and port 5004 for rtp should be enough. You have to make sure the Grandstream is configured to accept those ports, and the router is configured to pass those ports to your Grandsteam.

I you can disable the router in your modem, that would make life easier. If it is a DSL modem, you would have to pass the PPPoE settings from the modem to the Apple router. Or, if the apple router can forward ports, forward the previously mentioned ports to the Grandstream.

[bridonca]

I might add, it would be wise to first remove the apple router, and connect the Grandstream directly to the modem, to see if it works. If it does, you havr port forwarding NAT configuration issue which will hopefully be able to be addressed from my previous post.

[qwert97]

I made some progress on the set up. I reset the apple router and then the Grandstream and the modem. I first switched on the modem, then the router and then the Grandstream. After blinking red for a few minutes the light became stable. I picked up the phone and dialed a number and the call went through.

The problem now is that every time I have to make the call, I have to reset the ATA otherwise I get a busy signal. After a few minutes, once the light becomes stable I am able to make the call. Do you think that is still a port issue? As mentioned in my initial post I have forwarded 5060-5061, 6060-6061 and the 13000-13001. Any suggestions are welcome.

[qwert97]

Do you think port 5004 is the issue?

[bridonca]

Port 5004 is used to route RTP traffic. It does not have to be that port, I believe any unused port should be fine. It is just that the Grandstream seems to like that port as a default. You need to make sure you configure your router(s) to allow that port to have a direct bidirectional path from your Grandsteam to the internet. You also need a SIP port like 5060 or 5062. That you can get a call through now means you now need to work on your port routing.

You still clearly have a NAT issue, and the ports you need for VOIP still do not have a clear and certain bidirectional path to the internet. The router is left to guess what the correct path is, and usually it does a poor job of it. If you have 2 NAT routers in the chain, I am guessing the NATs being the DSL modem, and the Apple router, the problem is compounded. One NAT is bad enough, Two NATs are even worse. That is why you are having such flaky results.