I want to say a little more about the Talkswitch.

Right out of the box you can dial another extension directly, and you have to dial 9 to get an outside line. But you can reconfigure it to get an outside line immediately. Then to dial another extension you have to press the Flash key first. For instance for the first extension you would press "Flash-1-1-1".

It works with plain old phones, plain old wireless phones, plain old fax machines and proprietary Talkswitch phones as well as some other proprietary phones.

See www.Talkswitch.com.