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<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:11.0pt;
font-family:Verdana'>Hi guys,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:11.0pt;
font-family:Verdana'>I recently faced an issue regarding SIP registration: I
have a 2-NIC Linux PC, with eth0 set to address 192.168.1.1 (NATted over public
network, with address 89.X.Y.Z) and eth1 set to address 1.1.1.1. In [sip.conf] I
set general option<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'>bindaddr=0.0.0.0
; IP address to bind to (0.0.0.0 binds to all)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:11.0pt;
font-family:Verdana'>Then I have configured an account as following:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:11.0pt;
font-family:Verdana'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'>[999]<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'>type=friend<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'>username=999<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'>host=dynamic<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'>port=5080<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'>context=sipfrom<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'>nat=no<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'>canreinvite=no<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'>call-limit=8<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'>videosupport=no<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'>disallow=all<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'>allow=alaw<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'>qualify=15000<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 face="Courier New"><span
style='font-size:9.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:11.0pt;
font-family:Verdana'>So far, so good.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:11.0pt;
font-family:Verdana'>Now, I have an internal process (onto Linux PC) which is a
SIP endpoint and should register to Asterisk as 1.1.1.1:5080, but an external
entity (i.e. a SIP endpoint over public Internet) is trying to register to
Asterisk as <a href="mailto:999@89.X.Y.Z">999@89.X.Y.Z</a>:5060 and the
registration SUCCEEDS! When I launch the CLI command sip show peers, I see a
row like this:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:11.0pt;
font-family:Verdana'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:11.0pt;
font-family:"Courier New"'>999/999
1.1.1.1
5060 OK (3 ms)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:11.0pt;
font-family:Verdana'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:11.0pt;
font-family:Verdana'>Can someone explain me this kind of behaviour? Is it
normal? Can I restrict registration of 999 peer only to SIP UA from network
1.1.1.X?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:11.0pt;
font-family:Verdana'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:11.0pt;
font-family:Verdana'>Thanks for your help! Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:11.0pt;
font-family:Verdana'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:11.0pt;
font-family:Verdana'>Alberto Aggio<o:p></o:p></span></font></p>
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