Wireless VoIP
One of the great points that VoIP gives, it’s the variety of medias that you can use.
You can phone over Ip using a wire cable (Ethernet 10/100 BaseT twisted pairs).
You can do it by using a coaxial cable, or an optic fiber with an appropriate interface.
You can even dot it on a single wired line (slower so lower quality).
You can use a regular phone, or a special TCP/IP phone.
But the best is that you can find wireless VoIP phone too.
On short distance you can use the DECT phones (Europe) or WiFi (USA).
For long distance communications there is the satellite version.
So I hope that the Quality of service will be soon a dead problem so we can communicate on a unique
type of media that is the internet working.
I think to solve this problem would be to consider having two big backbones (may be three with video).
One would be for the data transfer solely (asynchronous) and the other(s) for VoIP (and/or video).
This way the network administrators should accept VoIP.
They don’t like to manage a network including VoIP because they have to deal with the bandwidth they need to give to either data transfer or telephony.
Depending on the traffic VoIP can take a lot of the bandwidth, reducing dramatically the data transfer.
Conclusion
In the future, I am pretty sure that VoIP will provide a lot of new job opportunities and boost the internetworking even more…