I'd like to know if it will work:

I have my domain and I´m serving a webpage in a nginx to the internet, but if I type my domain in my laptop inside LAN I access to my modem/router configuration, I cannot access to the web server unless I type the IP address. I would like to add a Bind server after the modem/router -> (port forward, ports 80 and 5060), if the request is www.mydomain.com bind should resolve the nginx IP address and serve it, and if it is a voip request should address to the voip server and if I'd like to access to the website from inside LAN I'd like to type mydomain.com. Could I do it with this configuration? Do I need something else?

Thanks in advace!