A method for providing land mobile radio,LMR, content using a land mobile radio network and a cellular data network, said method comprising: generating, at a first land mobile radio unit, land mobile radio content formatted in accordance with a land mobile radio application layer protocol; wherein the LMR content and the LMR network are configured based on different airlink protocols, and in order to provide communication via either the LMR network or the cellular data network using the first LMR unit, a LMR protocol stack is partitioned into multiple layers including a LMR application layer and a LMR transport layer, and wherein the LMR application layer is configured to provide interpretation and processing of voice, data and control information and the LMR transport layer is configured to provide delivery of the voice, data and control information over the transmission medium; communicating the land mobile radio content over said land mobile radio network using a land mobile radio transport layer protocol; receiving at a land mobile radio base station the land mobile radio content formatted in accordance with the land mobile radio application layer protocol; encapsulating the received application layer land mobile radio content at the land mobile radio base station into a packet switched transport layer datagrams for communicating over said cellular data network by encapsulating said land mobile radio content with a packet switch protocol header prior to communicating the land mobile radio content over the cellular data network, wherein the content of the application layer is encapsulated at the LMR base station within packet switched transport datagrams; and communicating said encapsulated land mobile radio content over said cellular data network using a cellular transport layer protocol. generating, at a first land mobile radio unit, land mobile radio content formatted in accordance with a land mobile radio application layer protocol; wherein the LMR content and the LMR network are configured based on different airlink protocols, and in order to provide communication via either the LMR network or the cellular data network using the first LMR unit, a LMR protocol stack is partitioned into multiple layers including a LMR application layer and a LMR transport layer, and wherein the LMR application layer is configured to provide interpretation and processing of voice, data and control information and the LMR transport layer is configured to provide delivery of the voice, data and control information over the transmission medium; communicating the land mobile radio content over said land mobile radio network using a land mobile radio transport layer protocol; receiving at a land mobile radio base station the land mobile radio content formatted in accordance with the land mobile radio application layer protocol; encapsulating the received application layer land mobile radio content at the land mobile radio base station into a packet switched transport layer datagrams for communicating over said cellular data network by encapsulating said land mobile radio content with a packet switch protocol header prior to communicating the land mobile radio content over the cellular data network, wherein the content of the application layer is encapsulated at the LMR base station within packet switched transport datagrams; and communicating said encapsulated land mobile radio content over said cellular data network using a cellular transport layer protocol.