<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">That's the general idea with protocol aware fixup and NAT.<div><br><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div>-Ryan</div></span>
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<br><div><div>On Feb 3, 2011, at 11:43 AM, Anthony Kouloglou wrote:</div><br class="Apple-interchange-newline">
<div bgcolor="#ffffff" text="#000066">
<font size="-1"><font face="Trebuchet MS">Thanks Ryan,<br>
so i leave the cisco router using as source IP address the
private one and the other gateway that does the NAT, has to be
aware of SIP protocol;<br>
then, it will change the source ip in the sip message that the
voice gateway sends to the ISP from the private to the real one.<br>
it is so?<br>
</font></font><br>
On 3/2/2011 18:34, Ryan Ratliff wrote:
<blockquote cite="mid:AB989B00-B138-4E97-8131-8298FA42A776@cisco.com" type="cite">Your device doing the NAT needs to support SIP fixup
so it modifies the internal IP to the external one inside the SIP
messages.
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<span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; ">
<div>-Ryan</div>
</span>
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<div>On Feb 3, 2011, at 10:29 AM, Anthony Kouloglou wrote:</div>
<br class="Apple-interchange-newline">
<div bgcolor="#ffffff" text="#000066"> <font size="-1"><font face="Trebuchet MS"> Hi, <br>
i have a 2801 and i am trying to register it with a SIP
ITSP that requires proxy authentication.<br>
Unfortunately, router is connected with it's fa0/0 to
the internet and has a private IP.<br>
This IP is full NATted on another router that connects
it to the internet.<br>
I have managed to get it registered but the local ip is
always the private one.<br>
How can i change this so that the ITSP manages to reach
me?</font></font><span style="font-size: 10pt; color:
silver;" lang="EN-US"></span><span style="font-size:
12pt;" lang="EN-US"></span>
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