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During the GSM deployment in the CCC Camp, Daniel Willmann noticed that the LCR and the MNCC were closing the local connection over unix sockets communication quite so often. After some debugging, Peter Stuge noticed that openBSC was closing the connection since write was returning 0. Then, I suggested that it could be a malformed message with zero length. By skipping empty messages, Peter confirmed that the connection between the LCR and the MNCC was not closing anymore. However, there was no voice in the calls that went over MNCC. After some more debugging I found that we were not building GSM_TCHF_FRAME over MNCC appropriately in the TRAU multiplexer code, since we forgot to msgb_put() the message.
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