|Thanks to both respondents to my question (yes, I probably did jump in both feet first without looking!).|
I has put a PDF with a diagram of my current configurations on my Sharepoint site: http://sharepoint.innov8group.com.a...
I have shown all the relevant pieces of equipment and how they are currently connected. As the diagram shows, I am currently connected to my ISP (iiNet) through the Belkin VoIP modem/router that is now connected to iiNet with the static IP address they have assigned me (this device is also the only DHCP and NAT server in my local network - on its LAN side it is configured to give out IP addresses in the 10.1.1.3 to 10.1.1.255 range).
Most of the devices on my local LAN use dynamic IP addressing (including the VoIP phones that are connected to various switches throughout the home office), but the router has a fixed address of 10.1.1.1, the Epygi Quadro 2X VoIP PBX is connected to the local network on its WAN side with a fixed IP address of 10.1.1.2 (the LAN port on the Quadro is not connected to anything but this device is capable of acting as a router and NAT server) and my data server is connected with a fixed IP address of 10.1.1.100.
All of this is currently working, including the phones - apart from the capability to create a remote extension on the VoIP PBX and the ability to access files remotely on the server.
From what I've read about the Quadro, the best way to establish a remote extension (I will use a softphone on my laptop which has a wireless broadband card) is for it to have a static IP address on the Internet (my ISP has provided me with two extra static IP addresses). I gather that what I now need to do is to reconfigure the Quadro so its WAN IP address is one of the static IP addresses instead of the fixed IP address it currently has on my local LAN. I suspect that if I then configured its LAN side as a DHCP server and connected the VoIP phones to it on that side (they currently connect to it through my local network but on its WAN side) it would come close to working.
What I'm not sure about are the following:
1) Where would I physically connect the Quadro box (it is currently connected to one of the 4 LAN ports on the router)?
2) Do I need to make any configuration changes to the router to let the Quadro box (and the server) connect directly to the Internet with its new static IP address (I see in the router configuration settings a number of things that look like they might need to be set up - under its WAN settings it has options for "ATM PVC" which at present appear to be only defining one connection but it has options for seven others and under the "ROUTE" settings it seems I could add a Static Route)?
3) Would I still be able to have the phones connect to the Quadro box through its WAN connection (which would not now be in my local LAN address range) or would they have to be connected on its LAN side?
I'm trying to avoid this as I only have one Cat5 cable running from my office where several of the phones are to my equipment room where the Quadro box and the router are. I gather if I set up a separate network on the land side of the Quadro box just for the phones I would need to physically connect the phones to it. But perhaps I can connect the LAN port on the Quadro box to one of my switches and the phones could then access the second network I would establish on the Quadro box - or would the fact that I would have DHCP running on the Quadro box as well as on the router confuse things?
I could run another cable if absolutely necessary but I also use a softphone on my desktop computer to give me an extension on the Quadro box - that is very useful to be able to automatically dial from my Outlook contact list - and, like the phones, the desktop machine is on my local LAN.
4) How would I physically connect the server to be accessible both from my local LAN and directly from the Internet via the second static IP address provided by my ISP? Would I need two network cards in the server (as it happens, it does have two)? And if that's the case, do I need something running on the server to somehow link the two network connections that I would then have so that the files on the server could be accessed either by any device on my local LAN or remotely via my laptop?
Does anyone know of a really good "dummies" guide to all of this? 20 years ago I was a country large systems specialist for IBM so I am technically-capable but I'm just not up to speed with modern networking (or VoIP).