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A number of committees are working toward solving both the Land Mobile Radio (LMR)/LTE Push-To-Talk (PTT) interoperability issues and LTE/LTE PTT interoperability issues. Meanwhile, the 3GPP standards body is crafting 3GPP TS 23.283, Mission-Critical Communication Interworking with Land Mobile Radio Systems, or the Interworking Function (IWF). The IWF is to be the interface that will provide solid interoperability between Mission-Critical Push-To-Talk (MCPTT) and LMR networks…

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