Choppy voip connection

Question

I have 1MB wireless link from my ISP. I am using Cisco VOIP phones in my company. Over the months my VOIP quality is not good(on/off connectivity),though my internet is somehow working fine. When I talked to my ISP , they told me to use Cisco switch / router instead of Nortal. Moreover ISP also saying that the switch / router can be configured to full duplex/ half duplex because ISP equipment can be switched to half/duplex.
-->My questions.
1-what cisco router/switch should I use with voip phones ?
2-What duplex setting should be on the router/switch so voip quality be remains optimum.
3-Is 1MB link can be used for voip?
4-Is it possible to configure voip phones to full/half duplex ?
Please help. Thanks.

Answer 1

Hi,
2. If you're currently running your phones over a wireless connection, this can cause problems. Wireless doesn't have guaranteed bandwidth and it's half duplex.
If you were to switch this out with a router and switch, you could make every link full duplex.
Full duplex is what you should run everywhere. The only modern technology you should be running half-duplex on is wireless, because that's just the way it works.
1. The router depends on your company size and what you want to use it for.
3. 1 MB link may be alright, but again, it depends on how many active phone calls, what your data usage is, and what codec you're running.
4. Phones are auto-negotiating, and they will use either.