Desk Phone Dock turns an iPhone into a landline with speakerphone.
With Desk Phone Dock, use your iPhone as your one and only integrated wired desk phone in your office or home environment. You can make and receive calls like you did with a traditional wired phone. You don’t have to look up a phone number in the other devices any more. Your iPhone is always fully charged and ready to go at any time.
via Cult of Mac