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The '''Inter-working Function''' (IWF) is a method for interfacing a wireless telecommunication network with the [[Public Switched Telephone Network|PSTN]]. The IWF converts the data transmitted over the air interface in to a format suitable for the [[Public Switched Telephone Network|PSTN]].
IWF contains both the hardware and software elements that provide the rate adaptation and protocol conversion between [[Public Switched Telephone Network|PSTN]] and the wireless network.
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