Hi all,

(Won't allow me to select correct model upon raising this forum thread)

I work for a VoIP provider, and we dabble in broadband as well.

We have been using the TP-Link TD-W9970 as a basic datalink router, which are great for that purpose. 

However, we also use voicelink circuits, which are on a private network.

Previously, before TP-links we had been using Zyxel VMG1312-B10D to do both data and voice circuits without issue.

The main problem we are coming across, is for the private networks, the WAN would still use PPP to authenticate and we have a set list of subnets, router IPs and the available range for each new install. Now when we are confriguring the LAN to have an IP address in the subnet of the private network, it is dropping the WAN connection. I have tried to set the LAN using the next available address, and static assign the WAN, but I am then getting a message stating these can not be in the same subnet. 

For the purposes that we use the private network, (allows us to browse directly to voip phones and additonal monitoring etc) we would need these to be within the same subnet. 

Has anyone has the same or a similar issue with these? Are the W9970s just not a valid option for what we are trying to achieve? 

For clarification, we had tested with the Zyxels, matched the config as exact as possible onto the TP link but they don't work, whereas the Zyxel was perfectly happy and allowed us to browse remotely to phones and was fine with the WAN and LAN being in the same subnet. 

Kind regards