Osmocom's Base Station Controller for 2G mobile networks
https://osmocom.org/projects/osmobsc
0620b37189
Every DTAP message coming from the MSC has a header (see struct dtap_header) that contains message type, length, and link ID. The link ID indicates SAPI and channel type of a given message. In dtap_rcvmsg() we allocate a new message buffer and copy the received message into it. The old message buffer is freed by the caller then. The link ID value parsed from DTAP header is usually being stored in the control buffer of a message buffer (i.e. msgb->cb). Due to a mistake, it was stored in the old (to be freed) message, while the new (to be forwarded) message always had link_id = 0x00! This change resolves the problem with sending SMS during a voice call, when MT signalling goes through FACCH, while MO signalling goes through SACCH. Change-Id: I7675e1ce4436fad836778261ac9d446fa8f81483 Related: OS#3716 |
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README
About OsmoBSC ============= OsmoBSC originated from the OpenBSC project, which started as a minimalistic all-in-one implementation of the GSM Network. In 2017, OpenBSC had reached maturity and diversity (including M3UA SIGTRAN and 3G support in the form of IuCS and IuPS interfaces) that naturally lead to a separation of the all-in-one approach to fully independent separate programs as in typical GSM networks. OsmoBSC was one of the parts split off from the old openbsc.git. Before, it worked as a standalone osmo-bsc binary as well as a combination of libbsc and libmsc, i.e. the old OsmoNITB. Since the standalone OsmoMSC with a true A interface (and IuCS for 3G support) is available, OsmoBSC exists only as a separate standalone entity. OsmoBSC exposes - A over IP towards an MSC (e.g. OsmoMSC); - Abis interfaces towards various kinds of BTS; - The Osmocom typical telnet VTY and CTRL interfaces. Find OsmoBSC issue tracker and wiki online at https://osmocom.org/projects/osmobsc https://osmocom.org/projects/osmobsc/wiki OsmoBSC-NAT is a specialized solution to navigating RTP streams through a NAT. (Todo: describe in more detail)