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ATA (analog telephone adapter
No, the voltage from the adapter should match the voltage required by the appliance.
you should consider the load the adapter will be under, as well as the required voltage conversion, what kind of connector is required and what thickness of cable would be needed
A modern Mac will have Bluetooth built in so an adapter is not required.
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If you need to use an older serial device, than a USB to serial adapter is required. This adapter has all of the required drivers programmed into it to ensure that the use of your serial device is seamless.
You will need a 3.5mm Audio Earphone Headphone Microphone Adapter for Apple iPhone 3G to plug in your headphones.
a VOIP adapter
Adapter cards in computers allow the computer to connect to a wireless network. To use an adapter card a computer either needs a USB port or a PCMCIA slot.
A USB wireless adapter will work just fine on a desktop. A PCMCIA (cardbus) wireless adapter may present problems as most desktops do not have PCMCIA slots. There are ways around this problem however, such as pcmcia-to-PCI adapter cards & the like.
NIC
The Wireless adapters should not be required for computers because they are not mobile and have better connection with the Ethernet. Netgear is the most popular type of adapter and is recommended only for laptops.