Does anyone know how to forward the port for voip to another modem?  I am not happy with the tp-link for the voice calls.  Have got an optus modem that worked perfectly for the voip calls before I transferred to a different provider for the internet and voip calls.  So want to know if it is possible to connect the optus modem to the tp-link modem and get the voip port forward to the optus modem for the voip calls? ... View more