Sorry guys, I should have already sent such details...so....<br><br>1. Yes, device is behind NAT (for ram)<br>2. Bellow is sip.configuration file<br><br>[general]<br>bindport=5060<br>bindaddr=0.0.0.0<br>context=invalid-context<br>musicclass=default<br>externip=56.236.64.79<br>allowguest=no<br>useragent=PBX<br>maxexpirey=7200<br>defaultexpirey=3600<br>realm=PBX<br>progressinband=never<br>disallow=all<br>allow=ulaw<br>allow=alaw<br>register =&gt; pbx1:psw1@196.222.62.196<br><br>[6464]<br>type=friend<br>dtmfmode=rfc2833<br>context=default<br>nat=yes<br>canreinvite=no<br>qualify=2000<br>host=dynamic<br>callgroup=7<br>pickupgroup=7<br>username=6464<br>secret=6464<br>disallow=all<br>allow=ulaw<br>allow=alaw<br>allow=g729<br>callerid=Frist Name &lt;6464&gt;<br>subscribecontext=hints<br>mailbox=6464@default<br>accountcode=6464<br><br><b><i>"joakimsen@gmail.com" &lt;joakimsen@gmail.com&gt;</i></b> wrote:<blockquote class="replbq" style="border-left: 2px solid rgb(16, 16, 255);
 margin-left: 5px; padding-left: 5px;"> Post the relevant configuration files we'd be glad to help.<br><br>On 11/6/07, Kim Joung-il <kimjoungil@yahoo.com> wrote:<br>&gt; Hello!<br>&gt;<br>&gt; We are using several Linksys SPA-941 in our office. After IP change occur<br>&gt; devices seems not to be reachable, actually unavailable! Devices is<br>&gt; connected, e.g. we can place a call using SPA-941 but can not receive any<br>&gt; calls...<br>&gt;<br>&gt; Kim<br><br></kimjoungil@yahoo.com></blockquote><br><p>&#32;__________________________________________________<br>Do You Yahoo!?<br>Tired of spam?  Yahoo! Mail has the best spam protection around <br>http://mail.yahoo.com