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Vadim Yanitskiy axilirator at gmail.com> If yes, can it [silent call] be done in OpenBSC or any such way > exists to do this or any other alternative does exists? Please check out http://ftp.osmocom.org/docs/latest/, you can find OsmoNiTB / OsmoMSC user manuals there. Silent call feature is supported, but not documented. Feel free to contribute! With best regards, Vadim Yanitskiy.