40 lines
1.7 KiB
C
40 lines
1.7 KiB
C
#pragma once
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#include <osmocom/core/msgb.h>
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#include <osmocom/msc/gsm_data.h>
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#include <osmocom/msc/transaction.h>
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/* These are the interfaces of the MSC layer towards (from?) the BSC and RNC,
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* i.e. in the direction towards the mobile device (MS aka UE).
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*
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* 2G will use the A-interface,
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* 3G aka UMTS will use the Iu-interface (for the MSC, it's IuCS).
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*
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* To allow linking parts of the MSC code without having to include entire
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* infrastructures of external libraries, the core transmitting and receiving
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* functions are left unimplemented. For example, a unit test does not need to
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* link against external ASN1 libraries if it is never going to encode actual
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* outgoing messages. It is up to each building scope to implement real world
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* functions or to plug mere dummy implementations.
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*
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* For example, msc_tx_dtap(conn, msg), depending on conn->via_iface, will call
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* either iu_tx() or a_tx() [note: at time of writing, the A-interface is not
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* yet implemented]. When you try to link against libmsc, you will find that
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* the compiler complains about an undefined reference to iu_tx(). If you,
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* however, link against libiu as well as the osmo-iuh libs (etc.), iu_tx() is
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* available. A unit test may instead simply implement a dummy iu_tx() function
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* and not link against osmo-iuh, see tests/libiudummy/.
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*/
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/* Each main linkage must implement this function (see comment above). */
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extern int iu_tx(struct msgb *msg, uint8_t sapi);
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int msc_tx_dtap(struct ran_conn *conn,
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struct msgb *msg);
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int msc_gsm48_tx_mm_serv_ack(struct ran_conn *conn);
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int msc_gsm48_tx_mm_serv_rej(struct ran_conn *conn,
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enum gsm48_reject_value value);
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int msc_tx_common_id(struct ran_conn *conn);
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