Ekiga gives error: "cannot register remote host is offline"

hello,
I am a novice and i am trying to simulate DOS testbed. I wanted to register ekiga softphone with asterisk but it gives me the following error message
"failed to register, remote host is offline"
Please i really need your help/advise. the following are the sip.conf files as well as the ekiga’s setting. Please help.

[general]
context = default
srvlookup = yes
videosupport=yes

[205]
host=dynamic
secret=welcome
type=friend
qualify=200
context=yucheng

[206]
secret=welcome
host=dynamic
type=friend
permit=192.168.1.3/255.255.255.0
qualify=no
context=yucheng

Sounds to me that the request isn’t reaching Asterisk machine, so the Asterisk configuration is irrelevant.

I notice you either didn’t read, or ignored the README-SEROUSLY-bestpractices document, but that is not the problem here and actually makes it easier for you to connect.

whats the “READ ME SERIOUSLY” document?

The document that should be supplied with every copy of Asterisk and appears, prominently, in the top level directory of the source distribution. It has been there since, at least, 1.6.1.0.

E.g. svn.digium.com/svn/asterisk/bran … ctices.txt

It first appeared over three years ago;

[quote]r247502 | lmadsen | 2010-02-18 16:38:17 +0000 (Thu, 18 Feb 2010) | 10 lines

Add best practices documentation.

(issue #16808)
Reported by: lmadsen

(issue #16810)
Reported by: Nick_Lewis
Tested by: lmadsen

Review: reviewboard.asterisk.org/r/507/
[/quote]