Ideally, anyone doing VoIP who is non-technical should get it from their ISP, and buy an ISP-supported router/modem/ATA as well. This significantly reduces treoubleshooting issues if you have a single suplplier and don't really know what you are doing (Or the day to day user doesn't).
However, where this isn't possible, here are a few suggestions:
Use a router/modem that also has an analogue connection for the VoIP line to go to a "normal" phone - this typically means you don't get any firewall configuration issues and the prioritisation of voice traffic is done by the router.
Otherwise, at least ensure the router/modem you use SUPPORTS VoIP and the firewall can work with it - especially if you are on a single IP address using NAT.
Remember, you can only prioritise voice traffic leaving your router/modem - once it is into the ADSL/Cable and Internet cloud, it's a free for all unless you use the same ISP for both and they do actually prioritise voice traffic - and even then, it's limited to within their network.
Due to the above, make sure you run a decent speed ADSL service from a decent supplier. One of those cheap 256k down and 64k up offerings is only going to lead to problems later....
I've been running VoIP at home for the last 5-6 years, and have recently moved over to iiNet's "Naked DSL" here so I don't even have a Telstra or any other kind of fixed line now...just the VoIP line from iiNet and a couple of others whcih are better for things like international calling, etc. It's never going to have the guarantee of a regular phone line, but as long as you have a working mobile in the house for 000 and such if you need it, it's more than good enough for most people, most of the time...and with the right Internet and phone tarriff can save you a fortune.
Jeff
1994 300TDi Defender
2010 TDV8 RRS
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