1) Make sure the new router is compatible with Intermedia’s Voice Services: https://kb.intermedia.net/Article/3119. This list will tell you if your new router is; recommended, serviceable, not recommended or incompatible. If your router is listed as not recommended or incompatible your VoIP phone service will be impacted. However, you can either replace it or you can put it into bridge mode to connect to another serviceable router that would manage the VoIP traffic. Please see https://kb.intermedia.net/Article/3049 for reference. Please see https://kb.intermedia.net/Article/3049 for reference.
2) Once you’ve confirmed that your router is compatible, you will want to make sure that all of the necessary requirements are met to ensure your phone system works optimally by selecting this link: https://kb.intermedia.net/Article/3013 and following the guidelines.
You can also locate this information by selecting your new router’s make/model listed in this link: https://kb.intermedia.net/Article/3119 and following the instructions to disable SIP ALG, resolving any potential DNS issues, and adjusting any firewall settings (or anything else listed for that particular router, including bandwidth management).
3) Make sure your router is the only router on your network that your phones will be connecting to. If your router is behind a 4-port modem/gateway provided by your internet service provider (ISP), you may need to contact your ISP and request they put the modem/gateway in “true bridge mode” by disabling DHCP and NAT (if this hasn’t previously been completed). This will cause the modem/gateway to only have one useable port, but that port will be used to connect the new router, which will handle the DHCP and NAT for your network.
4) Connect your Intermedia VoIP phones to the available ports in the back of your new router. If you need more ports to connect additional phones or devices, please do not connect another router as that will cause an issue with your phone system due to Double-NAT. We highly recommend using a network switch to gain additional ports for more devices to connect to your network.