Clever ways to propogate the correct IP addy?

OK, so I got my wrp400 working mostly. The problem I am still facing is that incoming calls still have one way audio. They can hear me, I cannot hear them... so after a bit of search and testing and reading and manipulating, I found that this worked:
SIP setings...
Substitute VIA Addr --> yes
EXT IP --> my.public.ip.address
I don't have a static public IP address, though. So, this is not a long term solution.
The problem, evidently, is that the Voice part of the wrp400 is sending its local IP address (10.0.0.xxx) out as its public IP even though the wrp400 is in full DMZ, and all ports of the public IP are assigned and open through to the wrp400. Basically, it just doesn't know its real world IP address.
Why this only happens on incomming calls must (IMO) be an indicator of some automatic sensing that the router allows the external network to do on outgoing calls, but on incoming calls it specifies it internally... it just specifies the wrong addy.
Is there a setting that will force use of external vs. internal IP information?
Message Edited by wrp400 on 01-23-2009 10:38 AM
Solved!
Go to Solution.

I'm not sure of the differences with a WRP400 and other Linksys/Sipura devices, but the WRP400 is described in the same ATA Administration Guide so it must be similiar to the other adapters.
The NAT Mapping Enable setting will cause the adapter to use its external ip address if that address is known. The key  word here is known. If it doesn't know the external address it will use the address it does know, the local network address.  There are several ways the adapter can discover its external ip address.  One way, as you have learned, is to hard code the address in the EXT IP: field.  This posting by DogFace05 outlines two additional ways:
I have found that if you have a proxy configured to register and the registration is successful, if there is a received= and a rport= on the sip 200 OK message in response to the registration the adapter will save the external address and port number returned if you have instructed it to do so by the Handle VIA received:/Handle VIA rport: settings on the Sip Tab.  Some voip providers do not include these parameters, others do.
Using a STUN server is a common way to determine the external ip address and external port numbers.  With a STUN server the adapter sends several messages to the server and the STUN server sends them back showing the external ip address and port numbers received.  You can use any STUN server that responds quickly.
With a STUN server you usually include the settings Substitute VIA Addr: and Send Resp To Src Port:
A good description of the NAT Support Parameters is found here.
Message Edited by hw on 01-24-2009 07:58 AM

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