[Asterisk-Users] Re: Get SIP to work over very limited network access

[Tzafrir Cohen]

On Thu, Sep 22, 2005 at 01:30:01AM -0300, Alchaemist wrote:
> Hi,
> 
>         Some way of VPN seems to be the only solution.
>         But, you should try something really silly first.
>         Try to setup your asterisk to listen in one of the open ports (ie 
> 21, 22) with SIP you will require two connections, thus two open ports, 
> instead with IAX2, one port will do it, (You can try DIAX, its nice, and 
> really simple).
>         There is a chance, (there always is), that your friend's ISP is 
> allowing all traffic over port 21 and 22, TCP AND UDP.... see?

UDP port 53 is probably a better choice, if you don't use it already.

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