Keywords: SIP, NAT, proxy

The solution can be found if someone wants to take up these requests:

 - http://bugs.digium.com/bug_view_page.php?bug_id=0000359
 - http://bugs.digium.com/bug_view_page.php?bug_id=0000104

JT



Chris Hariga wrote:

This is bull... I can't believe that...
Read more on NAT and Voip here:
http://www.voip-info.org/wiki-NAT+and+VOIP

It's not simple. The server must be reached in order to allow registration for
clients. A server inside a NAT can't be reached unless you use port
forwarding.
A client inside can reach a server outside and there are ways to
keep a connection
open in the NAT. Asterisk does not support this very well.

The other side of the coin is the contstruction of SIP and SDP. That's a long
story, but it ends in something like:
Asterisk help clients on the inside of a NAT with NAT=yes in SIP.CONF, but
can't work the other way as of today.

Must be a solution...
Do some research, add som code and we will all be happy!
IPv6 is a solution, if NAT is avoided.

/O

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of WipeOut
Sent: Monday, October 13, 2003 9:57 AM
To: [EMAIL PROTECTED]
Subject: Re: [Asterisk-Users] No sound with SIP Phones on the Internet

Chris Hariga wrote:

Yes, my Asterisk is behind a NAT but I forward all ports
(100-56000) to my Linux box.


There is your problem.. Asterisk does not like playing behind NAT.. The UA's can be made to work behind NAT but the server must have a public IP address..

-- *** Olle E. Johansson, [EMAIL PROTECTED]

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Runbov�gen 10, 192 48 Sollentuna, Sweden
Phone: +46 8 594 78 810, Fax: +46 8 594 78 820
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