<div><font face="verdana,sans-serif">Hello Vallimamod,</font></div>
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<div><font face="verdana,sans-serif">The best way to keep a user behind nat, is sending OPTIONS:</font></div>
<div><font face="verdana,sans-serif"></font> </div>
<div><font face="verdana,sans-serif">modparam("nathelper", "natping_interval", 30)<br>modparam("nathelper", "ping_nated_only", 0)<br>modparam("nathelper", "sipping_bflag", 7)<br>
modparam("nathelper", "sipping_from", "sip:pinger@PROXY_IP")</font></div>
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<div><font face="Verdana">From the book: "Building Telephony Systems with OpenSIPS" Flavio E Goncalves:</font></div>
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<div><font face="Verdana">"The parameters natping_interval, ping_nated_only, sipping_bflag, and<br>sipping_from, controls how to ping the clients to maintain the NAT mapping<br>open. Most of these parameters are self explanatory, but pay attention to the<br>
sipping_bflag. If the bflag is set to 7, the NATHELPER module will ping<br>using an OPTIONS SIP request from the address established in the parameter<br>sipping_from. It is much safer to use the OPTIONS request instead of a dummy<br>
UDP packet, because some NAT implementations require an outbound packet to<br>keep the NAT mapping open and the client will answer the OPTIONS request with<br>any SIP response, which will do the trick."</font></div>
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<div>Regards!<br></div>
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<div class="gmail_quote">2011/2/4 Vallimamod ABDULLAH <span dir="ltr"><<a href="mailto:vallimamod.abdullah@imtelecom.fr">vallimamod.abdullah@imtelecom.fr</a>></span><br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">Hello,<br><br>On Feb 4, 2011, at 11:03 AM, Iņaki Baz Castillo wrote:<br><br>> [...]<br>
<div class="im">> And the server is responsible for keeping the registrations and not<br>> loosing them when restarting.<br></div>> [...]<br><br>Just a related question: what about the nat binding ?<br>Does the nathelper module keep sending the keep-alive message for natted phones after restart ?<br>
<br>I have noticed that sometime phones behind nat are not able to receive incoming calls or presence notifications upon server restart but I did not have time to look at it yet.<br><br>Regards,<br><font color="#888888">Vallimamod Abdullah<br>
.<br></font>
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