From: "Rich Gauszka" 

Dunno. It does look like VOIP needs quite a few ports open

http://www.bcr.com/bcrmag/2002/07/p10.php

But if you want to let VOIP traffic move from a public IP network onto your
premises, you have to leave lots of ports open, explained Gary Audin,
president of consultancy Delphi, Inc. For each voice conversation, two TCP
or UDP ports have to be opened to allow H.323 or Session Initiation
Protocol (SIP) signaling-one port for each direction. Then, for the voice
traffic itself, two UDP ports must be opened and, optionally, two more UDP
ports may be opened for Real-Time Control Protocol (RTCP), which monitors
performance.

The VOIP ports run in sequences starting with Port 1024, which is a talk
port, then 1025 to monitor 1024, then Port 1026 to listen, 1027 to monitor
1026, and so on, Audin explained.

Note that 2-4 UDP ports must be open for the duration of each call. If you
need to support more than one simultaneous phone call, you'll have to open
up a pool of many more ports. "You can create a blocking environment
at your firewall if you run out of ports that are in your pool," Audin
said.

"Glenn Meadows"  wrote in message
news:41f682eb$1{at}w3.nls.net...
> Won't a consumer Firewall/router block those ports accessing anyway? (Not
> sure what David's seeing/having a problem with, but I would think his
> entrance router should keep all the VOIP traffic out of his internal
> network.)
>
>
> --
> Glenn M.
>
>
> "Rich Gauszka"  wrote in message
> news:41f670f4$1{at}w3.nls.net...
>> You can try blocking udp/tcp port 5060
>>
>> http://techdirt.com/articles/20041028/0212235.shtml
>>
>> BT has put in place a fairly simplistic, but obvious, block on most third
>> party VoIP providers . All they're doing is blocking port 5060, which is
>> often used by SIP servers.
>>
>> "David B"  wrote in message
>> news:41f65fa9$1{at}w3.nls.net...
>> > I'm not sure this would be an option since this is for a personal net,
> not
>> > a corporate one.
>> >
>> > I was hoping to block some ports if needed.
>> > "Geo"  wrote in message
news:41f628f6$1{at}w3.nls.net...
>> >> www.fortinet.com
>> >>
>> >> not cheap but it can block skyPE and I believe it can do layer 7
>> >> filtering.
>> >>
>> >> Geo.
>> >>
>> >> "David B"  wrote in message
>> >> news:41f52cde$1{at}w3.nls.net...
>> >>> Is there a way to block VOIP? Is it a standard port?
I have someone
>> >>> using
>> >>> something called GloPhone and I would like to block
it at my router.
>> >>>
>> >>>
>> >>
>> >>
>> >
>> >
>>
>>
>
>

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