Netgear ADSL microfilter $9.95 at Aussie PC shop
"This device allows you to use your telephone line whilst staying connected to the internet using an ADSL Modem. This product has 2 ports, Line and Phone to allow this.
NETGEAR offers wireless, Ethernet, powerline and phoneline networking products through a complete line of routers, gateways, switches, hubs, and adapters. NETGEAR products offer the strongest security and privacy options available to protect home and business customers."
Sorry no cashback with Aussie PC shop