<html>This may be outside the scope of this list, but maybe someone will incidentally have a suggesion.<br>Anyway, we use a Cisco SIP phone (I believe it is 7960). This works fine on our local network<br>with our SIP proxy program (we have our own so please don't ask who provides it ;-) we do).<br><br>I always set<br><br> Phone IP Address: X.X.X.Y<br> Subnet Mask<br> <br> Sip number (in several places)<br> Sip proxy IP address: X.X.X.Z<br> Port (5060)<br><br>note that proxy and Phone IP address are on same network. As I say, this works fine.<br><br>NOW, we have a SIP proxy running on network A.B.C.D and our Sip Phone is on W.X.Y.Z<br>(completely different networks). In general we can get from W.X.Y network to A.B.C network<br>via ping, telnet, ssh, etc. However, we cannot seem to ping the SIP phone from other networks.<br>My guess is that while the SIP phone address is W.X.Y.Z, the router through which it goes may<br>have the address of W.X.Y.V (same network, different IP address) so to the external world<br>the SIP phone looks like it has the address W.X.Y.V rather than W.X.Y.Z, and so W.X.Y.Z cannot<br>be pinged (nor any other IP functions). But I can't set the SIP address to W.X.Y.V (actually I can but<br>that is the address of the router so it will be a conflict). I do set the SIP's gateway to W.X.Y.V but that<br>does not help. The SIP phone can be pinged locally but not from a different network.<br><br>i figure as long as I cannot ping the SIP phone from a different network, through the router, the SIP phone<br>will not be able to reach the proxy machine, A.B.C.D.<br><br>Any suggestions how I might make that IP address (W.X.Y.Z) available to the outside world?<br><br>
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