CISCO SIP

[David Timms]

tony.chamberlain at lemko.com wrote:
> This may be outside the scope of this list, but maybe someone will
...
> i figure as long as I cannot ping the SIP phone from a different
> network, through the router, the SIP phone will not be able to reach
> the proxy machine, A.B.C.D.
> 
> Any suggestions how I might make that IP address (W.X.Y.Z) available
> to the outside world?
If all parties are routed, then you should have no problem. But if you 
are using a firewall/NAT, then the firewall has to know about the SIP 
protocol {ie application layer gateway}, so that it can track and proxy 
the extra connections that are formed between the devices.

DaveT.