have Asterisk installed and all SIP extentions are working inside the NAT, however, when I try connecting from external SIP phones, i hear no dial tone.<div><br class="webkit-block-placeholder"></div><div>sip.conf is as follows
</div><div><span class="Apple-style-span" style="font-family: 'Courier New'; font-size: 10px; line-height: 21px; ">externip = <a href="http://dedra.dyndns.org">dedra.dyndns.org</a><br>
localnet=<a href="http://192.168.0.0/255.255.255.0">192.168.0.0/255.255.255.0</a><br>
nat=yes</span></div><div><font class="Apple-style-span" face="'Courier New'" size="2"><span class="Apple-style-span" style="font-size: 10px; line-height: 21px;"><br class="webkit-block-placeholder"></span></font>
</div><div><font class="Apple-style-span" face="'Courier New'" size="2"><span class="Apple-style-span" style="font-size: 10px; line-height: 21px;">am I doing anything wrong? Please assist. I am using Grandstream sip phones.
</span></font></div><div><br class="webkit-block-placeholder"></div><div><br class="webkit-block-placeholder"></div>