Inter-working function
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The Inter-working Function (IWF) is a method for interfacing a wireless telecommunication network with the Public Switched Telephone Network. The IWF converts the data transmitted over the air interface in to a format suitable for the Public Switched Telephone Network.
IWF contains both the hardware and software elements that provide the rate adaptation and protocol conversion between a landline destination Public Switched Telephone Network (PSTN) and the network for both data and fax services. The IWF is required as a network element to support circuit switched data.