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This paper presents some aspects of the communications in distributed systems, with a special accent on the needs of VoIP systems. It describes some interactions between servers, using different types of queries, that belong to various protocols. It also presents the problem of the server waiting synchronously for each individual query to be executed and thus the need for decoupling query execution from the rest of the processing. The problem is similar to the one of slow peripheral devices. This would suggest that the solution to the query execution decoupling problem resembles the DMA functionality from the hardware, that is, an asynchronous interaction is needed.
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