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I want to find out whether or not my ISP is blocking the ports 5050 and 6060 which I need for my voip software on my iPhone. I'm using a 3G stick with a prepaid plan, and I'm using the internet sharing option on my mac to get internet on my iPhone through my macbook's wifi.

And if not, I'm looking for a way to get my voip software working.

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Use this site. Enter the port number you want to check and click Check.

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If you're not running a service on that port, it also says the isp is blocking the port.. However, I quickly made a java application to listen on port 5050 and 6060 and it seems like the isp isn't blocking the ports... – Sander Declerck Jan 9 '12 at 19:48
Hm, that's odd. It doesn't say anywhere on the site that a service needs to be running. So your java app solved your problem? – SaintWacko Jan 9 '12 at 19:52

Open a terminal. Try the following commands, replacing the portion in brackets with the server name or IP of your VoIP server:

telnet [voip server name or ip] 5050
telnet [voip server name or ip] 6000

If it is blocked, telnet will not connect (you'll receive an error about this immediately or after a brief moment).

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