<div dir="ltr"><div><div><div><div>Hi List:<br><br></div>This question is SIP related, I'm writing to the list just in case any SIP expert can help.<br><br></div>I'm facing random cases where some phones send to my OpenSips proxy a REGISTER with VIA and CONTACT host part with 0.0.0.0 address.<br><br></div>As far as I know this is not right, I can not see any similar in RFCs.<br><br></div>It happens mainly with Grandstream phones, but I saw this with 3CX softphones the last week.<br><div><div><br></div><div>The headers look like:<br></div><div><br>Via: SIP/2.0/TLS 0.0.0.0:30201;branch=z9hG4bK1519166325;rport;alias
<br><br>Contact: <sip:MASKED-USERNAME@0.0.0.0:30201;transport=tls>;reg-id=1;+sip.instance="<urn:uuid:00000000-0000-1000-8000-000B828E658A>"
<br><br></div><div>The issue happens using UDP and TLS protocol, I can discard a firewall ALG<br><br></div><div>The expires header is at configured value (1200 or 120 seconds) and all other headers (from, to, callId, ... ) seems to be OK<br></div><div><br></div><div>My questions is: This is right according RFC or is a bug on those phones? Maybe is right and I'm doing something wrong in my OpenSips config?<br><br></div><div>Thanks for your help,<br><br></div><div>Carlos Oliva<br></div><br><div><br><br></div><div><br></div><div><br><div><div><div><div><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><table cellspacing="0" cellpadding="0" border="0" width="600" height="15"><tbody><tr><td width="1%" valign="top"><br></td><td width="33%" valign="top" align="center"><br></td><td width="2%" valign="top" align="left"><br></td><td width="71%" valign="top"><br></td></tr></tbody></table></div></div></div></div></div></div>
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