You can easily network 4 sites with UCx. In fact, we have a customer who has 7 sites networked and all the sites operate off of ONE UCx 450. We also have another customer who will have a projected 11 sites networked to a single UCx 450 by the end of the year. The site that will have 11 sites also have some Norstar systems currently, which means they can re-use their Norstar sets by networking a UCx Digital Gateway Server back to the main UCx 450.
The parameters to make the single UCx solution happen are not hard:
1. Make sure the main UCx has a Public IP address. This can be accomplished by either having a dedicated Static IP from the ISP for the UCx, OR by putting the Static IP Address of the ISP Router in the Public IP Address settings in the Norstar Settings and SIP Settings section of the UCx programming.
2. If using the Static IP Address of the ISP Router, or a network Router, you have to open Ports 7000 for the Avaya\Nortel sets, Port 5060 for the IP sets (This can be changed if Port 5060 isn't desired to be used), Port 443 for off site network access to manage the UCx if a Remote Access VPN isn't already in place, Port 5063 for Android\iPhone soft phone clients, and Ports 10000-13999 for the RTP Media Packets.
3. Set the S1 of the IP sets to be the EXTERNAL IP Address defined in Step 1 or 2.
4. if using the Digital Gateway Server (DGS), set the DGS to register to the main UCx as the Host Server.
5. IF the UCx and DGS, or IP sets are ALL on a corporate WAN, then the process is to simply set the S1 of the IP sets to the IP Address of the UCx.
This may seem like a lot, but it takes approx. 15-20 minutes to do this.
And remember, UCx DOES NOT require keycodes or licenses to do any of the trunking or networking. The licensing is based on Users and not features.
I hope this helps and have a blessed day!
Stocking Distributor for E-Metrotel